SELECTOR GUIDES CROSS-REFERENCE
1-1
_. -_ .._._----_ .._. __ ._---- ------_._-.
II
I
MEMORIES SELECTION GUIDE
NOTES Boldface denotes industry standard part numbers. Operating temperature ranges MOS: OOC to 70°C CMOS: -40°C to 85°C and -55°C to +125°C ECL: Consult individual data sheets TIL: Military, -55°C to +125°C; Commercial, O°C to 70°C.
FOOTNOTES
ss Second source 1
MOS power supplies Three +12, ±5 V One +5 V All MOS outputs are three-state exp,ept the 6570 and 6580 series which are open-collector.
2
Character generators include shifted and unshifted characters, ASCII, alphanumeric control, math, Japanese, British, German, European, and French symbols.
1-2
MEMORIES SELECTION GUIDE (continued)
II
RAMs Organization
Part Number
Access Time (ns max)
Number of Power Supplies1
Number of Pins
Second Source
MOS DYNAMIC RAMs 4096 x 1 4096 x 1 4096 x 1
MCM4096-6 MCM4096-16 MCM4096-11
250 300 350
3 3 3
16 16 16
ss ss ss
4096 x 1 4096 x 1 4096 x 1
MCM4027A-2 MCM4027A-3 MCM4027A-4
150 200 250
3 3 3
16 16 16
ss ss ss
4096 x 1 4096 x 1 4096 x 1
MCM6604A MCM6604A-2 MCM6604A-4
350 250 300
3 3 3
16 16 16
4096 x 1 4096 x 1
MCM6605A MCM6605A-2
300 200
3 3
22 22
1 1 1 1
MCM4116A-15 MCM4116A-20 MCM4116A-25 MCM4116A-30
150 200 250 300
3 3 3 3
16 16 16 16
/ ss ss ss ss
16.384 x 1
MCM4516A-15*
150
1
16
ss
65.536 x 1
MCM6664A-15*
150
1
16
ss
MCM6810. MCM68A10 MCM68B10
450 360 250
1 1 1
24 24 24
MCM2114-20 MCM2114-25 MCM2114-30 MCM2114-45
200 250 300 450
1 1 1 1
18 18 18 18
SS
1024)( 4 1024)( 4 1024)( 4 1024)( 4
MCM21L14-20 MCM21L14-25 MCM21L14-30 MCM21 L 14-45
200 250 300 450
1 1 1 1
18 18 18 18
ss ss ss ss
1024)( 1 1024)( 1
MCM2115A MCM2125A
45 45
1 1
16 16
ss ss ss ss
16.384 16.384 16.384 16.384
x x x x
MOS STATIC RAMs 128 x'8 128 x 8 128 x 8 1024 x 1024)( 1024)( 1024)(
4 4 4 4
ss ss ss
4096 4096 4096 4096
x x x x
1 1 1 1
MCM6641-20 MCM6641-25 MCM6641-30 MCM6641-45
200 250 300 450
1 1 1. 1
18 18 18 18
4096 4096 4096 4096
x x x x
1 1 1 1
MCM66L41 -20 MCM66L41 -25 MCM66L41 -30 MCM66L41-45
200 250 300 450
1 1 1 1
18 18 18 18
ss ss ss ss
4096 x 1 4096 x 1 4096 x 1
MCM2147-55* MCM2147-70* MCM2147-85*
55 70 85
1 1 1
18 18 18
ss ss ss
*To be introduced. See Notes on Page 1-2.
1-3
I
•
MEMORIES SELECTION GUIDE (continued) Organization
Part Number \
Access Time (ns max)
Number of Power Supplies
Number of Pins
180**
1
14
Second Source
CMOS STATIC RAMs 64 x 1
MCM14505
256 x 1
MCM14537
700**
1
16
64 x 4
MCM14552
700**
1
24
256 x 4 256 x 4 256 x 4
MCM145101-1 MCM145101-3 McM145101-8
450 650 800
1 1 1
22 22 22
ss ss ss
MCMJ46504
450
1
18
ss
MCM14650S* MCM14650S-1 * McM14651S* MCM14651S-1*
460 300 460 300
1 1 1 1
16 16 18 18
ss ss ss ss
(
4096 x 1 1024 1024 1024 1024
x x x x
1 1 1 1
**Typical access time @ VOO
Organization
= 10 Vdc.
Part Number
Access Time (ns max)
Output
ECl BIPOLAR RAMs 8 x2 ,
MCM10143
15
EClOutput
24
256 x 1
MCM10144
26
EClOutput
16
16 x 4
MCM10145
15
EClOutput
16
1024 x 1
MCM10146
29
EClOutput
16
128 x 1 ·16 x 4
MCM10147
15
EClOutput
16
MCM10148
15
EClOutput
16
256 x 1
MCM10152
15
EClOutput
16
ss
ss ss ss ss
TTL BIPOLAR RAMs 256 x 4 256 x 4
MCM93412* MCM93422*
45 45
Open-Collector Three-State
22 22
ss ss
1024 x 4 1024 x 4
MCM93415* MCM93425*
45 45
Open-Collector Three-State
16 16
ss ss
*To be introduced. See Notes on Page 1 -2.
J-4
MEMORIES SELECTION GUIDE (continued)
EPROMs Part Number
Organization "
Access Time (ns max)
Number of Power Supplies I
Number of Pins
Second Source
5S
MOS EPROMs 1024 x 8 1024 x 8
MCM2708 MCM27A08
450 300
3 3
24 24
1024 x 8 1024 x 8
MCM68708 MCM68A708
450 300
3 3
24 24
2048 2048 2048 2048
TMS2716 TMS27A16 MCM2716* MCM27A16*
450 300 450 350
3 3 1 1
24 24 24 24
4096 x 8
MCM2532*
450
1
24
8192 x 8
MCM68764*
450
1
24
S5
x x x x
8 8 8 8
ss S5
55
ss ss ss
PROMs Access Time (ns max)
Output
MCM10139 MCM10149
25 30
EClOutput EClOutput
64 x 8 64 x 8
MCM5003/5303 MCM5004/5304
125 125
Open-Collector 2K Pull-Up
24 24
ss
512 x 4 512 x 4
MCM7620 MCM7621
70 70
Open-Collector Three-State
16 16
ss ss
512 x 4 512 x 4
MCM7640 MCM7641
70 70
Open-Collector Three-State
24 24
5S
1024 x 4 1024 x 4
MCM7642 MCM7643
70 70
Open-Collector Three-State
18 18
5S
1024 x 8 1024 x 8
MCM7680 MCM7681
70 70
Open-Collector Three-State
24 24
55
2048 x 4 2048 x 4
MCM7684* MCM7685*
70 70
Open-Collector Three-State
18 18
55
Organization
Part
~umber
Eel PROMs 32 x 8 256 x 4
TTL PROMs
*To be introduced. See Notes on Page 1 -2.
1-5
S5
S5
S5
5S
5S
•
I
MEMORIES SELECTION GUIDE (continued)
ROMs o rga nization
Part Number
Access Time (ns max)
Number of Power Supplies
Number of Pins
Second Source
MOS STATIC ROMs Character Generators2 128 128 128 128 128 128 128 128 128 128 128 128 128 128
x (7 x (7 x (9 x (9 x (9 x (9 x (9 x (9 x (9 x (9 x (9 x (9 x (9 x (9
x x x x x x x x x x x x x x
5) 5) 7) 7) 7) 7) 7) 7) 7) 7) 7) 7) 7) 7)
MCM6670 MCM6674 MCM66700 MCM66710 MCM66714 MCM66720 MCM66730 MCM66734 MCM66740 MCM66750 MCM66760 MCM66770 MCM66780 MCM66790
350 350 350 350 350 350 350 350 350 350 350 350 350 350
1 1 1 1 1 1
,
1 1 1 1 1 1 1 1
18 18 24 24 24 ' 24 24 24 24 24 24 24 24 24
ss ss ss ss ss ss ss ss
Binary ROMs 1024 1024 2048 1024 1024 1024 1024 2048 2048 4096 4096 8192 8192 8192
x x x x x x x x x x x x x x
8 8 8 8 8 8 8 8 8 8 8 8 8 8
MCM68A30-8 MCM68A308-7 MCM68A316-91 MCM68B30A MCM68A30A MCM68B308 MCM68A308 MCM68A316E MCM68A316A MCM68A332 MCM68A332-2* MCM68A364* MCM68A364-3* MCM68B364-3*
' 350 350 350 250 350 250 350 350 350 350 350 350 350 250
1 1
1 1 1 1 1 1 1 1
1 1 1 1
24 24 24 24 24 24 24 24 24 24 24 24 24 24
CMOS ROM
I
256 x 4
I
MCM14524
1200
*To be introduced. See Notes on Page 1 -2.
1-6
16
ss ss ss ss ss ss ss ss
MEMORY SYSTEMS For most purposes, memory systems are as unique and individualistic as is the variety of equipment in which they are used. There are, however, some computer systems - microcomputers and minicomputers - whose widespread acceptance results in the use of large numbers of memory systems of a specific architecture. Some of these have been identified, resulting in the standard, inventoried systems described below. Due to large-volume requirement and broad-based sales, these systems represent excellent values.
ADD-IN SYSTEMS FOR MICROCOMPUTERS Organization Application
32K x 8
16K x 9 Parity Option
16K
x
MMS68102A MMS68103A
8K
x
8
--r--- - - - - - f - - -
For 6800 Systems Dynam ic RAMs Standard Non-Volatile for 02 Kit Pseudo-Static RAMs
8K x 9 Parity Option
8
MMS68100 MMS68102 MMS68104 MMS68103
M MS68102A1
MMS68100-1 MMS68102-1
M MS68103A1
MMS68103-1
For 8080A Systems Dynamic RAMs
MMS80810
MMS80810-1
---------,---- ---
ADD-IN SYSTEMS FOR MINICOMPUTERS Organization Application
64K x 18
48K x 18
For LSI-1112/23 and PDP-11/03.123
32K x 18 32K x 16"
16Kx18 16Kx16*
MMS1102-34PC MMS1102-34'
MMS1102-32PC MMS1102-32*
LSI-11
MMS1110*
For General Automation 16/110,161220 For PDP-11 /05/ 10/35/40/45/ 50/55/60 Access Time 390 ns 360 ns 290 ns
MMS1117-58PC MMS1117-48PC MMSll17-38PC
MMS117-56PC MMS 117 -46PC MMSl17-36PC
MMS1118
MMS1118-1
MMS1118-2
MMS1118L*
MMS1118L-1*
MMSll18L-2*
MMSll17-54PC MMS1117-44PC MMS1117-34PC
MMS1117-52PC MMS1117-42PC MMS1117-32PC
MODULES FOR GENERAL-PURPOSE APPLICATIONS Dynamic RAMs 128K)( 18 bits
MMS3418
1-7
4K x 16
MMS1102-31PC MMS11 02-31 • MMS1110-2*
MMS1600-16* MMS1600-16P
For PDP-11s with "MF11 L" Backplane
8K x 18 8K x 16"
MMS1110-1*
MMS1600-32* MMS 1600-32P
For PDP-11 /04 and 11/34
12K x 18 12K x 16* ,
MMS1110-3*
II
I
THE O.FFICIAL MOS MEMORY CROSS-REFERENCE From Motorola APRIL 1979
PART NUMBER
MOTOROLA'S ACCESS TIME Ins max)
NO.OF PINS
POWER SUPPLIES
450 200450 150-300 200450 200450 200-450 55·85 350 350 350 350 450
24 18 16 18 18 18 18 24 24 24 24 24
+5 V +5V +12, ±5 V +5V +5V +5V +5 V +5 V +5 V +5 V +5 V +12, ±5 V
200450 200450 70·100 350 450-800 300460 300460 250-450 350 350 350
18 18 18 24 22 16 18 24 24 24 24
+5 +5 +5 +5 +5 +5 +5
1 DRAM 4 SRAM 8 EPROM 8 EPROM 8 EPROM 8 SROM 8 SROM 1 DRAM 1 DRAM 8 SRAM 8 SROM 8 EPROM
150-300 200450 450 . 300 450 350 350 120·250 250·350 250-450 250·350 450
16 18 24 24 24 24 24 16 16 24 24 24
+12, ±5 V +5 V +12, ±5 V +12,±5V +5 V +5 V +5 V +12, ±5 V +12, ±5 V +5 V +5 V +12, ±5 V
MCM4116A MCM2114 MCM2708 MCM27A08 MCM2716 MCM68A308 MCM68A316E MCM4027A MCM4096 MCM68810 MCM688308 MCM68708
4096 Xl SRAM 2048 ~ 8 EPROM 4096 X 1 SRAM 1024 X 4 SRAM 16,384 X 1 DRAM 4096 X 1 DRAM 4096 X 1 DRAM 1024 X 8 SROM 1024 X 8 EPROM
70-100 450 200450 200450 150-300 250-350 120·250 350 450
18 24 18 18 16 16 16 24 24
+5 V +5 V +5 V +5 V +12, ±5 V +12, ±5 V +12, ±5 V +5 V +12,±5V
MCM2147 MCM2716 MCM6641 MCM2114 MCM4116A MCM4096 MCM4027A MCM68A308 MCM2708
350 350 350 350
24 24 24 24
+5 V +5 V +5 V +5V
MCM68A316A MCM68A316E MCM68A332 MCM68A364
450 450·800 450 350 350 150-250 150-300 200450 55-85
24 22 24 24 24 16 16 18 18
+5V +5V +12, ±5 V +5V +5 V +12. ±5 V +12, ±5V +5 V +5V
MCM2116 MCM145101 MCM2708 MCM6.8A10 MCM68A30A· MCM4027A MCM4116A MCM21L14 MCM2147
ORGANIZATION DESCRIPTION
MOTOROLA PIN·TO·PIN REPLACEMENT
AMD Am2716 Am4044 Am9016 Am9114 Am91L14 Am9124 Am9147 Am92088 Am9217 Am9218 Am9232 Am9708
2048 4096 16,384 1024 1024 1024 4096 1024 2048 2048 4096 1024
X 8 EPROM Xl SRAM X 1 DRAM X 4 SRAM X 4 SRAM X 4 SRAM Xl SRAM X 8 SRAM X 8 SROM X 8 SROM X 8 SROM X 8 EPROM
MCM2716 MCM66L41 MCM4116A MCM2114 MCM'21L14 MCM2114 MCM2147 MCM68A308 MCM68A316A MCM68A316E MCM68A332 MCM68708
AMI S2114 S2114L S21.47 S4264 S5101 S6508 S6518 S6810 S6830 S6831 A S68318
1024 X 4 SRAM 1024 X 4 SRAM 4096 Xl SRAM 8192 X 8 SROM 256 X 4 SRAM 1024 X 1 SRAM 1024 Xl SRAM 128 X 8 SRAM 1024 X 8 SROM 2048 X 8 SROM 2048 X 8 SROM
V V V V V V V
+~V
+5 V +5 V +5 V
MCM2114 MCM21 L14 MCM2147 MCM68A364 MCM145101 MCM146508 MCM146518 MCM6810 MCM68A30A . MCM68A316A MCM68A316E
FAIRCHI·LD F16K 2114 F2708 F27081 2716 3508 F3516E FM4027 4096 F68810 F688308 F68708
16,384 1024 1024 1024 2048 1024 2048 4096 4096 128 1024 1024
X X X X X X X X X X X X
FUJITSU M82147 M8M2716 MB4044 M88114 M88116 M88224 M88227 M88308 M88518H
GENERAL INSTRUMENT R03-8316A R03-9316 R03-9332A R03-93648
2048 2048 4096 8092
X X X X
8 8 8 8
SROM SROM SROM SROM
HITACHI HM462716 HM435101 HM462708 HM468A10 HM46830 HM4704L HM4716 HM472114A HM4847
2048 X 8 EPROM 256 X 4 SRAM 1024 X 8 EPROM 128 X 8 SRAM 1024 X 8 SROM 4096 X 1 DRAM 16.384 X 1 DRAM 1024 X 4 SRAM 4096 X 1 SRAM
1-8
II PART NUMBER
ORGANIZATION DESCRIPTION
MOTOROLA'S ACCESS TIME (ns max)
NO.OF PINS
POWER SUPPLIES
4096 X 1 DRAM 1024 X 4 SRAM 1024 X 4 SRAM 16,384 X 1 DRAM 4096 Xl SRAM 1024 X 8 SROM 2048 X 8 SROM 2048 X 8 SROM 1024 X 8 EPROM 1024 X 8 EPROM 2048 X 8 EPROM 2048 X 8 EPROM 2048 X 8 EPROM 256 X 4 SRAM
120-250 200-450 200-450 150-300 70-100 350 350 350 300 450 450 350 350 450-800
16 18 18 16 18 24 24 24 24 24 24 24 24 22
+12, ± 5 V +5 V +5 V +12, ±5 V +5V +5V +5V +5 V +12, ±5 V +12, ±5 V +5 V +5 V +5 V +5V
MCM4027A MCM2114 MCM21 L14 MCM4116A MCM2147 MCM68A308 MCM68A316A MCM68A316E MCM27A08 MCM2708 MCM2716 MCM27A16 MCM27A16 MCM145101
1024 4096 1024 1024 4096 1024 16,384 4096 4096
X 4 SRAM X 1 DRAM Xl SRAM Xl SRAM X 1 DRAM X 4 SRAM X 1 DRAM Xl SRAM Xl SRAM
200-450 150-250 300-460 300-460 120·250 200-450 150·300 200-450 200-450
18 16 16 18 16 18 16 18 18
+5 V +12, ±5 V +5 V +5,V +12, ±5 V +5 V +12, ±5 V +5 V +5 V
MCM2114 MCM4027A MCM146508 MCM146518 MCM4027A MCM21 L14 MCM4116A MCM6641 MCM66L41
4096 X 1 DRAM 16,384 X 1 DRAM
120·250 150·300
16 16
+12, ±5 V +12, ±5 V
MCM4027A MCM4116
2048 X 8 SROM 4096 X 8 SROM
350 350
24 24
+5 V +5V
MCM68A316E MCM68A332
1024 X 8 EPROM 2048 X 8 EPROM 4096 X 1 DRAM 4096 X 1 DRAM 4096 X 1 DRAM 1024 X 4 SRAM 16,384 X 1 DRAM 1024 X 8.SROM 2048 X 8 SROM 4096 X 8 SROM 2048 X 8 SROM 8192 X 8 SROM 8192 X 8 SROM
450 450 120-250 250·350 200-450 200-450 150·300 350 350 350 350 350 250
24 24 16 16 18 18 16 24 24 24 24 24 24
+12, ±5 V +5 V +12,±5V +12, ±5 V +5 V +5 V +12, ±5 V +5 V +5 V +5V +5 V +5 V +5V
MCM2708 MCM2716 MCM4027A MCM4096 MCM6641 MCM2114 MCM4116A MCM68A308 MCM68A316A MCM68A332 MCM68A316E MCM68A364 MCM688364
1024 X 4 4096 Xl 1024 X 8 2048 X 8 8192 X 8 4096 Xl 4096 Xl 16,384 X 1
SRAM SRAM EPROM EPROM SROM SRAM SRAM DRAM
200·450 55-85 450 450 350 200-450 200·450 150·300
18 18 24 24 24 18 18 16
+5 V +5 V +12, ±5 V +5 V +5 V +5 V +5 V +12, ±5 V
MCM2114 MCM2147 MCM2708 MCM2716 MCM68A364 MCM6641 MCM66L41 MCM4116A
X 1 DRAM X 1 DRAM X 1 DRAM X 4 SRAM Xl SRAM X 8 EPROM Xl SRAM X 4 SRAM Xl SRAM X 8 SROM
150·250 250·350 150·300 200-450 55-85 450 200-450 450·800 300-460 350
16 16 16 18 18 24 18 22 16 24
+12, ±5 V +12, ±5 V +12, ±5 V +5 V +5 V +5 V +5 V +5V +5 V +5 V
MCM4027A MCM4096 MCM4116A MCM21 L14 MCM2147 MCM2716 MCM66L41 MCM145101 MCM146508 MCM68A308
2048 X 8 SROM
350
24
+5 V
MCM68A316A
2048 X 8 SROM 1024 X 8 EPROM 2048 X 8 EPROM
350 450 450
24 24 24
+5 V +12,±5V +5 V
MCM68A316E MCM2708 MCM2716
MOTOROLA PIN-TO-PIN REPLACEMENT
INTEL 2104A 2114 2114L 2117 2147 2308 2316A 2316E 2708-1 2708 2716 2716-1 2716-2 5101
INTERSIL D2114 MK4027 IM6508 IM6508-1 IM7027 IM7114 IM7116 IM7141 IM7141L
ITT ITT4027 ITT4116
MIC MIC2316E MIC2332
MOSTEK MK2708 MK2716 MK4027. MK4096 MK4104 MK4114 MK4116 MK30000 MK31000 MK32000 MK34000 MK36000 MK36000-4
NATIONAL MM2114 MM2147 MM2708 MM2716 MM5235 MM5257 MM5257L MM5290
NEC/EA IlPD414A IlPD414 IlPD416 IlPD2114L IlPD2147 IlPD2716 IlPD4104 IlPD5101 IlPD6508 EA2308/8308 IlPD or EA2316A/8316A IlPD or EA2316E/8316E EA2708 IlPD or EA2716
4096 4096 16,384 1024 4096 2048 4096 256 1024 1024
1~9
I
MOTOROLA'S ACCESS TIME (ns max)
NO.OF PINS
POWER SUPPLIES
350 350 350 350 350 350 550
24 24 24 24 24 24 ,24
+5 V +5 V +5V +5V +5 V +5V +12,-+5V
MCM66700 MCM66710 MCM66720 MCM66730 MCM66740 MCM66750 MCM6832
350 350 350 120-250 200450 350 350 350 250-350 450 450 150-250 450-800
24 24 24 ·16 18 24 24 24 16 24 24 16 ,22
+5 V +5 V +5 V +12, ±5 V +5 V +5 V +5 V +5 V +12,±5V +12, ±5 V +5 V +12, ±5 V +5 V
MCM68A308 MCM68A3OA MCM66700 MCM4027A MCM21L14 MCM68A316E MCM68A332 MCM68A364 MCM4116A MCM2708 MCM2716 MCM4027A MCM145101
X 1 SRAM X 8 SROM X 8 SROM X 8 EPROM X 4 SRAM
200450 55-85 350 350 450 450-800
18 18 24 24 24 22
+5 +5 +5 +5 +5 +5
2048 X 8 EPROM 1024 X 8 EPROM 2048 X 8 EPROM 4096 X 1 DRAM 4096 X 1 SRAM 1024 X 4 SRAM 16,384 X 1 DRAM 1024 X 8 SROM 4096 X 8 SROM
450 450 450 120-250 200-450 200450 150-300 350 350
24 24 24 16 18 18 16 24 24
+5 V +12, ±5 V +12, ±5 V +12, ±5 V +5 V +5 V +12, ±5 V +5 V +5 V
ORGANIZA'TlON DESCRIPTION
PART NUMBER
MOTOROLA PIN·TO·PIN REPLACEMENT
NITRON NC6570 NC6571 NC6572 NC6573 NC6574 NC6575 NC6832
128 X (9 X 128 X (9 X 128 X (9 X 128 X (9 X 128 X (9 X 128 X (9 X 2048 X 8
7) SROM 7) SROM 7) SROM 7) SROM 7) SROM 7) SROM SROM
SIGNETICS 2607 2608 2609 2660 2614 261.6 2633 2664 2690 2708 2716 4027 5101
1024 X 8 SROM 1024 X 8 SROM 128 X (9 X 7) SROM 4096 X 1 DRAM 1024 X 4 SRAM 2048 X 8 SROM 4096 X 8 SROM 8192 X 8 SROM 16,384 X 1 DRAM 1024 X 8 EPROM 2048 X 8 EPROM 4096 X 1 DRAM 256 X 4 SRAM
(
SYNERTEK SY2114 SY2147 SY2316A SY2316B SY2716 SY5101
1024 4096 2048 2048 2048 256
X 4 SRAM
V V V V V V
MCM21 L14 MCM2147 MCM68A316A MCM68A316E MCM2716 MCM145101
-.-
TEXAS INSTRUMENTS ,TMS 2516 TMS 2708 TMS 2716 TMS 4027 TMS4044 TMS 4045 TMS 4116 TMS 4700 TMS 4732
Part Number
MCM2716 MCM2708 TMS 2716 MCM4027A MCM6641 MCM2114 MCM4116A MCM68A308 MCM68A332
Guide---------------------...:.---------Directly 6800
G,",,;o
P'~P~7""O'
MPU com~ 1m)V,,,'oo
- 450 m
/68~
MCM21 L14P45
//-~ Motorola MOS Memory Prefix
Lo~wer
Version
Package Type
Motorola MOS Memory Prefix
P = Plastic L = Side Bl'!!ze C = Cerdip Frit-Seal Ceramic
1-10
Access Time Designator No Letter = ;;;, 450 ns A = ';;;350 ns B = ';;;250 ns
