Datasheet CYM1841APZ-55C, CYM1841APZ-45C, CYM1841APZ-35C, CYM1841APZ-30C, CYM1841APZ-25C Datasheet (Cypress Semiconductor)
...Page 1
256K x 32 Static RAM Module
CYM1841A
CYM1841B
CYM1841C
Cypress Semiconductor Corporation
• 3901 North First Street • San Jose • CA 95134 • 408-943-2600
June 13, 2000
Features
• High-density 8-megabit SRAM module
• 32-bit standard footprint supports densities from 16K
x 32 through 1M x 32
• High-speed CMOS SRAMs
—Access time of 12 ns
• Low active power
—5.3W (max.) at 25 ns
• SMD technology
• TTL-compatibl e inputs and outputs
• Low pr o file
—Max. height of 0.58 in.
• Av ailable in ZIP, SIMM, and angled SIMM footprint
• 72-pin SIMM versio n compa ti ble with 1M x 32
(CYM1851)
Functional Description
The CYM1841A/B/C are high-performance 8-megabit static
RAM modules organiz ed as 256K words by 32 bits . This m odule is constructed from eight 256K x 4 SRAMs (1841A/C) or
256K x 16 SRAMs (1841B) in SOJ packages mounted on an
epoxy laminate board with pins. Four chip selects (CS
1
, CS2,
CS
3
, CS4) are used to independently enable the four bytes.
Reading or writing c an be executed on individual bytes or any
combination of mul ti p le bytes through proper use of selec ts.
Writing to each byte is accomplished when t he appropriate
Chip Select (CS
) and Write Enab le (WE) input s are both LOW.
Data on the I nput/Output pins (I/ O) is written into the memory
location specifi ed on the address pins (A
0
through A17).
Reading the device is accomplishe d by taking the Chip Sel ect
(CS
) LOW while Write Enable (WE) remains HIGH. Under
these conditions, t he 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 at the high-impedance state
when write enable is LOW or the approp riat e chip selects are
HIGH.
Two pins (PD
0
and PD1) are used to i dentify module memory
density in applications where alternate versions of the JEDEC-standard modules can be interchanged.
The CYM1841A, CYM1841B, and CYM1841C are 100% pin,
package, and electrically identical. The CYM1841A utilizes
corner power and ground SRAMs, the CYM1841B utilizes
256K x 16 SRAMs, the CYM1841C utilizes center power and
ground SRAMs.
A 72-pin SIMM is offered for compatibility with the 1M x 32
CYM1851. This ver sion is sock et upg radabl e to the CYM1851.
Both the 64-pin and 72-pin SIMM modules are available with
either tin-lead or 10 micro-inches of gold flash on t he edge
contacts.
LogicBlockDiagram
1841A–1
A0–A
17
OE
I/O0–I/O
3
CS
3
I/O4–I/O
7
CS
1
18
44
44
44
44
CS
2
CS
4
I/O8–I/O
11
I/O16–I/O
19
I/O24–I/O
27
I/O12–I/O
15
I/O20–I/O
23
I/O28–I/O
31
PD0–GND
PD
1
–GND
PD
2
– OPEN (72-pin only)
PD
3
– OPEN (72-pin only)
WE
256K x 4
SRAM
256K x 4
SRAM
256K x 4
SRAM
256K x 4
SRAM
256K x 4
SRAM
256K x 4
SRAM
256K x 4
SRAM
256K x 4
SRAM
Page 2
CYM1841A
CYM1841B
CYM1841C
2
LogicBlockDiagram (1841B)
1841A–1
A0–A
17
OE
CS
3
I/O16–I/O
23
CS
1
18
8
8
8
8
CS
2
CS
4
I/O24–I/O
31
I/O0–I/O
7
I/O8–I/O
15
PD0– GND
PD
1
– GND
PD
2
– OPEN (72-pin only)
PD
3
– OPEN (72-pin only)
WE
256K x 16
SRAM
256K x 16
SRAM
Selection Guid e
1841C-12 1841B/C-15 1841A/B/C-20 1841A/B/C-25 1841A/B/C-35 1841A/B/C-45
Maximum Access Time (ns) 12 15 20 25 35 45
Maximum Operat ing
Current (mA)
1600 1600 1120 960 960 960
Maximum Standby
Current (mA)
480 480 480 480 480 480
Shaded areas contain preliminary information.
Page 3
CYM1841A
CYM1841B
CYM1841C
3
Pin Configurations
CS
WE
1841A–2
SIMM
Top View
NC
A
4
PD
3
PD
2
PD
0
GND
I/O
0
PD
1
I/O
1
I/O
8
I/O
2
I/O
9
I/O
3
V
CC
A
7
I/O
11
I/O
10
A
0
I/O
6
GND
NC
A
15
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
I/O
7
WE
A
8
A
9
I/O
4
I/O
5
A
14
CS
1
CS
3
A
16
GND
I/O
16
I/O
17
A
12
A
13
I/O
20
I/O
21
I/O
22
I/O
14
I/O
15
A
1
A
2
I/O
12
I/O
13
2
I/O
18
I/O
19
A
10
A
11
CS
4
A
17
OE
I/O
24
I/O
25
V
CC
A
6
I/O
28
I/O
29
I/O
26
I/O
27
A
3
A
5
66
68
70
65
67
69
I/O
23
GND
A
19
I/O
30
I/O
31
A
18
72
71
NC
NC
1841A–3
ZIP/SIMM
Top View
PD
0
V
CC
I/O
0
PD
1
I/O
1
I/O
8
I/O
2
I/O
9
I/O
3
I/O
10
V
CC
I/O
11
A
7
A
8
A
9
A
1
A
0
A
2
CS
2
GND
CS
4
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
A
14
CS
1
I/O
4
I/O
5
I/O
6
7
CS
3
A
16
GND
I/O
16
I/O
17
I/O
18
I/O
19
I/O
20
I/O
21
I/O
22
I/O
23
GND
GND
A
I/O
12
I/O
13
I/O
14
I/O
15
A
17
A
10
A
11
A
12
A
13
OE
I/O
24
I/O
25
I/O
26
I/O
27
I/O
28
I/O
29
I/O
30
I/O
31
A
3
A
4
A
5
A
6
64-Pin
72-Pin
15
I/O
Page 4
CYM1841A
CYM1841B
CYM1841C
4
Maximum Ratings
(Above which the useful life may be impaired. For use r guidelines, not tested.)
Storage Temperature
..................................... –
55°C to +125°C
Ambient Temperature wi th
Po wer Applied
.................................................... –
10°C to +8 5 °C
Supply Voltage to Ground Potential
..................–
0.5V to +7.0V
DC Voltage Applied to Outputs
in High Z State
..................................................... –
0.5V to +7 . 0V
DC Input Voltage
................................................. –
0.5V to +7 . 0V
Operating Range
Range
Ambient
Temperature
V
CC
Commercial 0°C to +70°C 5V ± 10%
Electrical Characteristics
Over the Operating Range
Parame-
ter Description Test Conditions
1841C
-
12
1841B/C
-
15
1841A/B/C
-20
1841A/B/C
-25, 35, 45
UnitMin. Max. Min. Max. Min. Max.
V
OH
Output HIGH
Voltage
VCC = Min., IOH = –4.0 mA 2.4 2.4 2.4 V
V
OL
Output LO W
Voltage
VCC = Min., IOL = 8.0 mA 0.4 0.4 0.4 V
V
IH
Input HIGH
Voltage
2.2 V
CC
2.2 V
CC
2.2 V
CC
V
V
IL
Input LOW
Voltage
–0.5 0.8 –0.5 0.8 –0.5 0.8 V
I
IX
Input Leakage Current
GND < VI < V
CC
–16 +16 –16 +16 –16 +16 mA
I
OZ
Output Leakage Current
GND < VO < VCC,
Output Disabled
–10 +10 –10 +10 –10 +10 mA
I
CC
VCC Operating
Supply Current
VCC = Max., I
OUT
= 0 mA,
CS
< V
IL
1600 1120 960 mA
I
SB1
Auto matic CS
Power-Down
Current
[1]
Max. VCC, CS > VIH,
Min. Duty Cycle = 100%
480 480 480 mA
I
SB2
Auto matic CS
Power-Down
Current
[1]
Max. VCC, CS > VCC -
0.2V,
V
IN
> VCC – 0.2V,
or V
IN
< 0.2V
240
200 200 mA
Capacitance
[2]
Parameter Descri ption Test Conditions Max. Unit
C
IN
Input Capacitance
[3]
T
A
= 25°C, f = 1 MH z,
V
CC
= 5.0V
70/20 pF
C
OUT
Output Capacitanc e 20 pF
Notes:
1. A pull-up resistor to V
CC
on the CS input is required to keep the device deselected during VCC power-up, otherwise ISB will exceed values given.
2. Tested on a sample basis.
3. 20 pF on CS
, 70 pF all others.
Page 5
CYM1841A
CYM1841B
CYM1841C
5
AC Test Loads and Waveforms
1841A–4
1841A–5
90%
10%
3.0V
GND
90%
10%
ALL INPUT PULSES
5V
OUTPUT
30 pF
INCLUDING
JIG AND
SCOPE
5V
OUTPUT
5 pF
INCLUDING
JIG AND
SCOPE
(a) (b)
<5ns <5ns
OUTPUT
R1481
Ω
R1481
Ω
R2
255
Ω
R2
255
Ω
167
Ω
Equivalent to: THÉ VENIN EQUIVALENT
1.73V
Page 6
CYM1841A
CYM1841B
CYM1841C
6
Switching Characteristics
Over the Operating Range
[4]
1841C-12 1841B/C-15 1841A/B/C-20 1841A/B/C-25
Parameter Description
Min. Ma x. Min. Max. Min. Max. Min. Max. Unit
READ CYCLE
t
RC
Read Cycle Time 12 15 20 25 ns
t
AA
Address to Data Valid 12 15 20 25 ns
t
OHA
Output Hold from Address Change 3 333ns
t
ACS
CS LOW to Data Valid 12 15 20 25 ns
t
DOE
OE LOW to Data Valid 7 8 13 15 ns
t
LZOE
OE LOW to Low Z 0 000ns
t
HZOE
OE HIGH to High Z 7 8 15 15 ns
t
LZCS
CS LOW to Low Z
[5]
3 31010ns
t
HZCS
CS HIGH to High Z
[5, 6]
7 8 20 20 ns
t
PD
CS HIGH to Power-Down 12 15 20 25
WRITE CYCLE
[7]
t
WC
Write Cycle Time 12 15 20 25 ns
t
SCS
CS LOW to Write End 9 10 15 20 ns
t
AW
Address Set-Up to Write End 9 10 18 20 ns
t
HA
Address Hold from Write End 0 000ns
t
SA
Address Set-Up to Write Start 2 222ns
t
PWE
WE Pulse Width 10 13 15 20 ns
t
SD
Data Se t-U p to Write End 7 81315ns
t
HD
Data Hold from Write End 1 122ns
t
LZWE
WE HIGH to Low Z 0 000ns
t
HZWE
WE LOW to High Z
[6]
0 507015015ns
Shaded areas contain preliminary information.
Notes:
4. Test conditions assume signal transition times of 5 ns or less, timing reference levels of 1.5V, input pulse levels of 0 to 3.0V, and output loading of the specified
I
OL/IOH
and 30-pF load capacitance.
5. At any given temperature and voltage condition, t
HZCS
is less than t
LZCS
for any given device. These parameters are guaranteed by design and not 100% tested.
6. t
HZCS
and t
HZWE
are specified with CL = 5 pF as in part (b) of AC Test Loads and Waveforms. Transition is measured ±500 mV from steady-state voltage.
7. The internal write time of the memory is defined by the overlap of CS
LOW and WE LOW. Both signals must be LOW to initiate a write and either signal can
terminate a write by going HIGH. The data input set-up and hold timing should be referenced to the rising edge of the signal that terminates the write.
Page 7
CYM1841A
CYM1841B
CYM1841C
7
Switching Characteristics
Over the Operating Range
[4
1841A/B/C-35 1841A/B/C-45
Parameter Description Min. Max. Min. Max. Unit
READ CYCLE
t
RC
Read Cycle Time 35 4 5 ns
t
AA
Address to Data Valid 35 45 ns
t
OHA
Data Hold from Address Change 3 3 ns
t
ACS
CS LOW to Data V alid 35 45 ns
t
DOE
OE LOW to Data V alid 2 5 30 ns
t
LZOE
OE LOW to Low Z 0 0 ns
t
HZOE
OE LOW to High Z 15 15 ns
t
LZCS
CS LOW to Low Z
[5]
10 10 ns
t
HZCS
CS HIGH to High Z
[5, 6]
20 20 ns
t
PD
CS HIGH to Power-Down 35 45 ns
WRITE CYCLE
[7]
t
WC
Write Cycle Time 35 45 ns
t
SCS
CS LOW to Write End 30 40 ns
t
AW
Address Set-Up to Write End 30 40 ns
t
HA
Address Hold from Write End 2 2 ns
t
SA
Address Set-Up to Write Start 2 2 ns
t
PWE
WE Pulse Widt h 30 35 ns
t
SD
Data Se t- U p to Wr ite End 20 25 ns
t
HD
Data Hold from Write End 2 2 ns
t
LZWE
WE HIGH to Low Z 0 0 ns
t
HZWE
WE LOW to High Z
[6]
015015ns
Page 8
CYM1841A
CYM1841B
CYM1841C
8
Switching Waveforms
Read Cycle No. 1
[8, 9]
Read Cycle No. 2
[8, 10 ]
Write Cycle No. 1 (WE Controlled)
[7]
Notes:
8. WE
is HIGH for read cycle.
9. Device is continuously selected, CS = VIL and OE= VIL.
10. Address valid prior to or coincident with CS
transition LOW.
PREVIOUS DATA VALID DATA VALID
t
RC
t
AA
t
OHA
1841A–6
ADDRESS
DATA OUT
DATA VALID
t
RC
t
ACS
t
DOE
t
LZOE
t
LZCS
HIGH IMPEDANCE
t
HZOE
t
HZCS
HIGH
IMPEDANCE
1841A–7
DATA OUT
OE
CS
t
WC
DATA VALID
DATA UNDEFINED
HIGH IMPEDANCE
t
SCS
t
AW
t
SA
t
PWE
t
HA
t
HD
t
HZWE
t
LZWE
t
SD
CS
WE
1841A–8
ADDRESS
DATA IN
DATA OUT
Page 9
CYM1841A
CYM1841B
CYM1841C
9
Write Cycle No. 2 (CS
Controlled)
[7, 11]
Note:
11. If CS
goes HIGH simultaneously with WE HIGH, the output remains in a high-impedance state.
Switching Waveforms
(continued)
t
WC
DATA VALID
DATA UNDEFINED
HIGH IMPEDANCE
t
SCS
t
AW
t
PWE
t
HA
t
HD
t
HZWE
t
SD
CS
WE
1841A–9
ADDRESS
DATA IN
DATA OUT
t
SA
Truth Table
CS WE OE Input/Output Mode
H X X High Z Deselect/Power-Down
L H L Data Out Read
L L X Data In Write
L H H High Z Deselect
Page 10
CYM1841A
CYM1841B
CYM1841C
10
Ordering Information
Speed
(ns) Ordering Code
Package
Name Package Type
Operating
Range
12 CYM1841CPM-12C PM02 64-Pin Plastic SIMM Module Commercial
CYM1841CP7-12C PM04 72-Pin Plastic SIMM Module
CYM1841CPZ-12C PZ03 64-Pin Plastic ZIP Module
15 CYM1841APM15C PM02 64-Pin Plastic SIMM Module Commercial
CYM1841APY-15C PM01 64-Pin Plastic SIMM Module (gold contacts )
CYM1841APT-15C PM01 64-Pin Plastic SIMM Module
CYM1841AP5-15C PN04 72-Pin Plastic Angled SIMM Module
CYM1841AP6-15C PM01 72-Pin Plastic Angled SIMM Module (gold contacts)
CYM1841AP7-15C PM04 72-Pin Plastic SIMM Module
CYM1841AP8-15C PM04 72-Pin Plastic SIMM Module (gold contacts)
CYM1841APN-15C PN02 64- Pin Plastic Angled SIMM Module
CYM1841APR-15C PZ0 1 64-Pin Plastic ZIP Module
CYM1841APZ-15C PZ03 64-Pin Plastic ZIP Module
CYM1841BPZ-15C PZ03 64-Pin Plastic ZIP Module
CYM1841BP7-15C PM04 72-Pin Plastic SIMM Module
20 CYM1841APM-20C PM02 64-Pin Plastic SIMM Module Commercial
CYM1841APY-20C PM01 64-Pin Plastic SIMM Module (gold contacts )
CYM1841APT-20C PM01 64-Pin Plastic SIMM Module
CYM1841AP5-20C PN04 72-Pin Plastic Angled SIMM Module
CYM1841AP6-20C PM01 72-Pin Plastic Angled SIMM Module (gold contacts)
CYM1841AP7-20C PM04 72-Pin Plastic SIMM Module
CYM1841AP8-20C PM04 72-Pin Plastic SIMM Module (gold contacts)
CYM1841APN-20C PN02 64- Pin Plastic Angled SIMM Module
CYM1841APR-20C PZ0 1 64-Pin Plastic ZIP Module
CYM1841APZ-20C PZ03 64-Pin Plastic ZIP Module
CYM1841BPZ-20C PZ03 64-Pin Plastic ZIP Module
CYM1841BP7-20C PM04 72-Pin Plastic SIMM Module
25 CYM1841APM-25C PM02 64-Pin Plastic SIMM Module Commercial
CYM1841APY-25C PM01 64-Pin Plastic SIMM Module (gold contacts )
CYM1841APT-25C PM01 64-Pin Plastic SIMM Module
CYM1841AP5-25C PN04 72-Pin Plastic Angled SIMM Module
CYM1841AP6-25C PM01 72-Pin Plastic Angled SIMM Module (gold contacts)
CYM1841AP7-25C PM04 72-Pin Plastic SIMM Module
CYM1841AP8-25C PM04 72-Pin Plastic SIMM Module (gold contacts)
CYM1841APN-25C PN02 64- Pin Plastic Angled SIMM Module
CYM1841APR-25C PZ0 1 64-Pin Plastic ZIP Module
CYM1841APZ-25C PZ03 64-Pin Plastic ZIP Module
CYM1841BPZ-25C PZ03 64-Pin Plastic ZIP Module
CYM1841BP7-25C PM04 72-Pin Plastic SIMM Module
Shaded areas contain preliminary information.
Page 11
CYM1841A
CYM1841B
CYM1841C
11
Document #: 38- M-00031-G
35 CYM1841APM-35C PM02 64-Pin Plastic SIMM Module Commercial
CYM1841APY-35C PM01 64-Pin Plastic SIMM Module (gold contacts )
CYM1841APT-35C PM01 64-Pin Plastic SIMM Module
CYM1841AP5-35C PN04 72-Pin Plastic Angled SIMM Module
CYM1841AP6-35C PM01 72-Pin Plastic Angled SIMM Module (gold contacts)
CYM1841AP7-35C PM04 72-Pin Plastic SIMM Module
CYM1841AP8-35C PM04 72-Pin Plastic SIMM Module (gold contacts)
CYM1841APN-35C PN02 64- Pin Plastic Angled SIMM Module
CYM1841APR-35C PZ0 1 64-Pin Plastic ZIP Module
CYM1841APZ-35C PZ03 64-Pin Plastic ZIP Module
CYM1841BPZ-35C PZ03 64-Pin Plastic ZIP Module
CYM1841BP7-35C PM04 72-Pin Plastic SIMM Module
45 CYM1841APM-45C PM02 64-Pin Plastic SIMM Module Commercial
CYM1841APY-45C PM01 64-Pin Plastic SIMM Module (gold contacts )
CYM1841APT-45C PM01 64-Pin Plastic SIMM Module
CYM1841AP5-45C PN04 72-Pin Plastic Angled SIMM Module
CYM1841AP6-45C PM01 72-Pin Plastic Angled SIMM Module (gold contacts)
CYM1841AP7-45C PM04 72-Pin Plastic SIMM Module
CYM1841AP8-45C PM04 72-Pin Plastic SIMM Module (gold contacts)
CYM1841APN-45C PN02 64- Pin Plastic Angled SIMM Module
CYM1841APR-45C PZ0 1 64-Pin Plastic ZIP Module
CYM1841APZ-45C PZ03 64-Pin Plastic ZIP Module
CYM1841BPZ-45C PZ03 64-Pin Plastic ZIP Module
CYM1841BP7-45C PM04 72-Pin Plastic SIMM Module
Ordering Information
(continued)
Speed
(ns) Ordering Code
Package
Name Package Type
Operating
Range
Page 12
CYM1841A
CYM1841B
CYM1841C
12
Package Diagrams
V
3.580
3.588
3.845
0.525
0.145 RE F
0.400
0.250
0.080
PIN 1
0.250
PIN 64
0.62 R .001+
3.35 (64 PINS)
0.250
0.125 DIA.
.001 2 PLCS
+
0.330
0.050
TYP
3.855
MAX
MAX
64-Pin Plastic SIMM Module PM01
64-Pin Plastic SIMM Module
PM02
3.580
3.588
0.135 RE F
0.400
0.250
0.080
PIN 1
0.250
PIN 64
0.62 R .001+
(64 PINS)
0.250
0.125 DIA.
.001 2 PLCS
+
0.350
0.050
TYP
3.845
3.855
MAX
0.585
0.595
3.348
3.352
72-Pin Plastic SIMM Module PM04
Page 13
CYM1841A
CYM1841B
CYM1841C
13
Package Diagrams
(continued)
64-Pin Plastic Angled SIMM Module
PN02
3.845/3.855
3.580/3.588
.350MAX
.220REF
.670/.680
.245/.255
.397/.403
PIN1
.075/.085 .050TYP
.061/.063R
.249/.251
3.348/3.352
.245/.255
72-Pin Plastic Angled SIMM Module PN04
MIN.
MAX.
3.640
3.660
0.050
TYP
0.330
0.008
0.014
0.120
0.150
0.050
0.050
0.135
0.165
0.015
0.025
0.250
TYP
0.100
TYP
0.500
MAX
MAX
0.100
TYP
DIMENSIONS IN INCHES
64-Pin Plastic ZIP Module PZ01
BottomView
Pin 1
Page 14
CYM1841A
CYM1841 B
CYM1841C
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Package Diagrams
(continued)
MIN.
MAX.
3.640
3.660
0.050
TYP
0.350
0.120
0.150
0.050
0.050
0.135
0.165
0.015
0.025
0.250
TYP
0.100
TYP
0.575
MAX
MAX
0.100
TYP
DIMENSIONSININCHES
Bottom View
Pin1
64-Pin Plastic ZIP Module PZ03
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