AS7C256-25PC Alliance Semiconductor, AS7C256-25PC Datasheet

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AS7C256-25PC

Manufacturer Part Number
AS7C256-25PC
Description
32,768 words x 8 bits SRAM
Manufacturer
Alliance Semiconductor
Datasheet

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Part Number:
AS7C256-25PC
Manufacturer:
ALLIANCE
Quantity:
1 742
Maximum Address Access Time
Maximum Output Enable Access Time
Maximum Operating Current
Maximum CMOS Standby Current
FEATURES
LOGIC BLOCK DIAGRAM
SELECTION GUIDE
GND
High Performance
32K 8
CMOS SRAM
A14
Vcc
• Organization: 32,768 words
• High speed
• Low power consumption
• 2.0V data retention (L version)
A0
A1
A2
A3
A4
A5
A6
– 10/12/15/20/25/35 ns address access time
– 3/3/4/5/6/8 ns output enable access time
– Active:
– Standby:
– Very low DC component in active power
COLUMN DECODER
A
7
660 mW max (10 ns cycle)
11 mW max, CMOS I/O
2.75 mW max, CMOS I/O, L version
INPUT BUFFER
A
8
256 128 8
(262,144)
A
ARRAY
9
10
A
11
A
ALLIANCE SEMICONDUCTOR
12
A
13
A
8 bits
CONTROL
32K 8 CMOS SRAM (Common I/O)
CIRCUIT
L
AS7C256-01
7C256-10
10
3
120
2.0
0.5
WE
OE
CE
I/O7
I/O0
7C256-12
12
3
115
2.0
0.5
DIP, SOJ, SOIC
TSOP 8 13.4
PIN ARRANGEMENT
• Equal access and cycle times
• Easy memory expansion with CE and OE inputs
• TTL-compatible, three-state I/O
• 28-pin JEDEC standard packages
• ESD protection > 2000 volts
• Latch-up current > 200 mA
7C256-15
15
4
110
2.0
0.5
– 300 mil PDIP and SOJ
– 330 mil SOIC
– 8 13.4 TSOP
Socket compatible with 7C512 and 7C1024
A11
A13
A14
A12
Vcc
WE
OE
A9
A8
A7
A6
A5
A4
A3
7C256-20
20
5
100
2.0
0.5
GND
I/O0
I/O1
I/O2
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
22
23
24
25
26
27
28
1
2
3
4
5
6
7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
AS7C256
7C256-25
6
0.5
25
90
2.0
28
27
26
25
24
23
22
21
20
19
18
17
16
15
7C256-35
35
8
80
2.0
0.5
21
20
19
18
17
16
15
14
13
12
11
10
9
8
Vcc
WE
A13
A8
A9
A11
OE
A10
CE
I/O7
I/O6
I/O5
I/O4
I/O3
AS7C256
AS7C256L
A10
CE
I/O7
I/O6
I/O5
I/O4
I/O3
GND
I/O2
I/O1
I/O0
A0
A1
A2
AS7C256-02
Unit
ns
ns
mA
mA
mA

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AS7C256-25PC Summary of contents

Page 1

... Vcc A12 A13 A11 A10 I/O7 I/ I/O6 I/ I/O5 16 I/O2 13 I/O4 15 GND 14 I/ A10 21 A11 I/ I/O6 A13 26 I/ I/O4 16 Vcc 28 15 I/O3 AS7C256 1 A14 14 GND 2 A12 AS7C256- 7C256-20 7C256-25 7C256- 100 90 80 2.0 2.0 2.0 0.5 0.5 0.5 Unit ...

Page 2

... When chip enable or output enable is HIGH, or write enable is LOW, output drivers stay in high-impedance mode. All chip inputs and outputs are TTL-compatible, and opera- tion is from a single 5V supply. The AS7C256 is packaged in all high volume industry standard packages. Symbol Min V – ...

Page 3

... MHz Room Temperature Test Conditions Max out AS7C256 AS7C256L Unit -35 Unit – – – – – – – 2.0 mA – 0.5 mA – 0.4 V – ...

Page 4

... AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA t OHZ t CHZ t PD 50% Unit Notes AAAA AAAA AAAA AA AAAA AAAA AAAA AA AA AAAA AAAA AAAA AAAA AAAA AAAA AA AA AAAA AAAA AAAA AS7C256-04 ...

Page 5

... AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA t DH AS7C256 AS7C256L Unit Notes AS7C256-05 AAAA AAAA AA AAAA AAAA AA AAAA AAAA AA AAAA AAAA AA AAAA AAAA AA AS7C256-06 ...

Page 6

... AAAA AAAA AAAA AAAA AAAA AAAA V AAAA AAAA AAAA AAAA AAAA AAAA IH AAAA AAAA AAAA AAAA AAAA AAAA AS7C256-07 Thevenin Equivalent: 168 D +1.728V out +5V 480 D out 255 5 pF* *including scope and jig capacitance GND Figure C: Output Load for CLZ CHZ AS7C256-10 specification ...

Page 7

... Normalized supply current I AA vs. cycle frequency 1/t a 1.4 1 5. 25°C a 0.8 0.6 0.4 0.2 0 125 Cycle frequency (MHz) Typical access time change t OL vs. output capacitive loading 4. 250 500 5.0 Capacitance (pF) AS7C256 AS7C256L SB1 a 80 125 100 AA 750 1000 AS7C256-11 ...

Page 8

... R&D Electronics RHODE ISLAND Dingley, Victoria Kitchen & Kutchin Inc. (617) 229-2660 +61-3-558-0444 3099 North First Street San Jose, CA 95134 (408) 383-4900 Fax (408) 383-4999 Copyright © 1995 All rights reserved AS7C256-25PC AS7C256-35PC AS7C256L-25PC AS7C256L-35PC AS7C256-25JC AS7C256-35JC AS7C256L-25JC AS7C256L-35JC AS7C256-25SC AS7C256-35SC AS7C256L-25SC ...

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