cym1840 Cypress Semiconductor Corporation., cym1840 Datasheet

no-image

cym1840

Manufacturer Part Number
cym1840
Description
256k X 32 Static Ram Module
Manufacturer
Cypress Semiconductor Corporation.
Datasheet
Features
Functional Description
The CYM1840 is a high-performance 8-megabit static RAM
module organized as 256K words by 32 bits. This module is
Selection Guide
Cypress Semiconductor Corporation
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum Standby Current (mA)
A
High-density 8-megabit SRAM module
High-speed CMOS SRAMs
— Access time of 20 ns
Independent byte and word controls
Low active power
— 6.2W (max.)
SMD technology
TTL-compatible inputs and outputs
Low profile
— Max. height of .350 in.
Small PCB footprint
— 1.8 sq. in.
0
Logic Block Diagram
WE
WE
CS
CS
CS
CS
A
17
0
0
1
1
2
3
18
256K x 4
256K x 4
256K x 4
256K x 4
SRAM
SRAM
SRAM
SRAM
4
4
4
4
I/O
I/O
I/O
I/O
0
8
16
24
I/O
I/O
I/O
I/O
3
11
19
27
3901 North First Street
1840-20
1120
320
20
256K x 4
256K x 4
256K x 4
256K x 4
SRAM
SRAM
SRAM
SRAM
constructed from eight 256K x 4 SRAMs in SOJ packages
mounted on an epoxy laminate substrate with pins. Four chip
selects (CS
enable the four bytes. Two write enables (WE
used to independently write to either the upper or lower 16-bit
word of RAM. Reading or writing can be executed on individual
bytes or on any combination of multiple bytes through the
proper use of selects and write enables.
Writing to each byte is accomplished when the appropriate
chip select (CS) and write enable (WE) inputs are both LOW.
Data on the input/output pins (I/O
location specified on the address pins (A
Reading the device is accomplished by taking the chip selects
(CS) LOW, while write enables (WE) remain HIGH. Under
these conditions the contents of the memory location specified
on the address pins will appear on the data input/output pins
(I/O).
The data input/output pins stay in the high-impedance state
when write enables (WE) are LOW or the appropriate chip
selects are HIGH.
4
4
4
4
1840–1
1840-25
256K x 32 Static RAM Module
1120
320
25
I/O
I/O
I/O
I/O
4
12
20
26
I/O
0
San Jose
I/O
I/O
I/O
Pin Configuration
, CS
1840-30
7
15
23
31
1120
320
30
1
, CS
2
I/O
I/O
I/O
I/O
I/O
I/O
, and CS
GND
WE
CS
CS
V
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
CC
October 1990 – Revised June 1993
A
A
A
A
A
A
A
A
A
10
11
12
13
14
15
1840-35
0
0
1
2
3
0
1
4
5
6
7
2
3
0
4
5
8
9
6
7
1
8
1120
320
35
CA 95134
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
3
X
) are used to independently
) is written into the memory
Top View
DIP
1840-45
1120
0
320
45
through A
CYM1840
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
0
408-943-2600
and WE
GND
I/O
I/O
I/O
I/O
A
A
CS
I/O
I/O
I/O
I/O
A
A
WE
A
A
I/O
I/O
I/O
I/O
A
A
CS
I/O
I/O
I/O
I/O
A
V
1840-55
17
CC
17
16
15
14
13
12
11
10
9
1120
320
1840–2
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
3
2
55
1
).
1
) are

Related parts for cym1840

cym1840 Summary of contents

Page 1

... SMD technology TTL-compatible inputs and outputs Low profile — Max. height of .350 in. Small PCB footprint — 1.8 sq. in. Functional Description The CYM1840 is a high-performance 8-megabit static RAM module organized as 256K words by 32 bits. This module is Logic Block Diagram ...

Page 2

... Test Conditions MHz 5. 481 5V 3.0V R2 GND 5 pF 255 INCLUDING JIG AND 1838–3 SCOPE (b) 1.90V 2 CYM1840 Ambient Temperature +70 C CYM1840 Min. Max. 2.4 0.4 2 –0.5 0.8 –20 +20 –50 +50 < V 1120 X IL 320 160 < 0.3V Max. 100 30 30 power-up, otherwise I will exceed values given ...

Page 3

... HIGH. The data input set-up and hold timing should be referenced to the rising edge of the signal that terminates the write. [3] 1840-20 Min. Max less than t for any given device. HZCS LZCS 3 CYM1840 1840-25 1840-30 Min. Max. Min. Max. Unit ...

Page 4

... Read Cycle No. 1 ADDRESS DATA OUT PREVIOUS DATA VALID [3] (continued) 1840-35 Min. Max [4, [ OHA 4 CYM1840 1840-45 1840-55 Min. Max. Min. Max ...

Page 5

... CURRENT [6] Write Cycle No. 1 (WE Controlled) ADDRESS DATA IN DATA OUT DATA UNDEFINED t RC DATA VALID 50 SCS PWE t SD DATA VALID t HZWE 5 CYM1840 t HZCS HIGH IMPEDANCE t PD 50% 1840– LZWE HIGH IMPEDANCE 1840–7 ICC ISB ...

Page 6

... Input/Output H X High Data Out L L Data In n Ordering Informatio Speed Ordering Code 20 CYM1840PD-20C 25 CYM1840PD-25C 30 CYM1840PD-30C 35 CYM1840PD-35C 45 CYM1840PD-45C 55 CYM1840PD-55C Document #: 38-M-00040 SCS PWE t SD DATA VALID t HZWE Mode Deselect/Power-Down Read Write Package Name Package Type PD06 60-Pin DIP Module ...

Page 7

... The inclusion of Cypress Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges. 60–Pin DIP Module PD06 2.990/3.010 .125/.175 CYM1840 .300/.350 .600TYP. ...

Related keywords