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PDF UPD444012A-X Data sheet ( Hoja de datos )
| Número de pieza | UPD444012A-X | |
| Descripción | 4M-BIT CMOS STATIC RAM 256K-WORD BY 16-BIT EXTENDED TEMPERATURE OPERATION | |
| Fabricantes | NEC | |
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DATA SHEET
MOS INTEGRATED CIRCUIT
µPD444012A-X
4M-BIT CMOS STATIC RAM
256K-WORD BY 16-BIT
EXTENDED TEMPERATURE OPERATION
Description
The µPD444012A-X is a high speed, low power, 4,194,304 bits (262,144 words by 16 bits) CMOS static RAM.
The µPD444012A-X has two chip enable pins (/CE1, CE2) to extend the capacity.
The µPD444012A-X is packed in 48-pin PLASTIC TSOP (I) (Normal bent).
Features
• 262,144 words by 16 bits organization
5 • Fast access time: 50, 55, 70, 85, 100, 120 ns (MAX.)
• Byte data control: /LB (I/O1 - I/O8), /UB (I/O9 - I/O16)
5 • Low voltage operation
(B version: VCC = 2.7 to 3.6 V, C version: VCC = 2.2 to 3.6 V)
• Low VCC data retention: 1.0 V (MIN.)
• Operating ambient temperature: TA = –25 to +85°C
• Output Enable input for easy application
• Two Chip Enable inputs: /CE1, CE2
Part number
Access time
Operating supply Operating ambient
Supply current
ns (MAX.)
Voltage
temperature At operating At standby At data retention
5 µPD444012A-BxxX 50 Note 1, 55, 70, 85, 100
V
2.7 to 3.6
°C
−25 to +85
mA (MAX.)
40 Note 2
45 Note 3
50 Note 4
µA (MAX.)
7
µA (MAX.)
3
µPD444012A-CxxX
70, 85, 100, 120
2.2 to 3.6
40
5 Notes 1. VCC ≥ 3.0 V
5 2. Cycle time ≥ 70 ns
5 3. Cycle time = 55 ns
5 4. Cycle time = 50 ns
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. M14464EJ5V0DS00 (5th edition)
Date Published July 2001 NS CP (K)
Printed in Japan
The mark 5 shows major revised points.
©
1999
1 page  
µPD444012A-X
Electrical Specifications
Absolute Maximum Ratings
Parameter
Supply voltage
Input / Output voltage
Operating ambient temperature
Storage temperature
Symbol
VCC
VT
TA
Tstg
Note –3.0 V (MIN.) (Pulse width : 30 ns)
Condition
Rating
–0.5 Note to +4.0
–0.5 Note to VCC + 0.4 (4.0 V MAX.)
–25 to +85
–55 to +125
Unit
V
V
°C
°C
Caution Exposing the device to stress above those listed in Absolute Maximum Rating could cause
permanent damage. The device is not meant to be operated under conditions outside the limits
described in the operational section of this specification. Exposure to Absolute Maximum Rating
conditions for extended periods may affect device reliability.
5 Recommended Operating Conditions
Parameter
Symbol
Condition
Supply voltage
High level input voltage
Low level input voltage
Operating ambient temperature
VCC
VIH 2.7 V ≤ VCC ≤ 3.6 V
2.2 V ≤ VCC < 2.7 V
VIL
TA
Note –1.5 V (MIN.) (Pulse width: 30 ns)
µPD444012A-BxxX
MIN.
MAX.
2.7 3.6
2.4 VCC+0.4
–
–0.3 Note
–
+0.5
–25 +85
µPD444012A-CxxX
MIN.
MAX.
2.2 3.6
2.4 VCC+0.4
2.0
–0.3 Note
VCC+0.3
+0.3
–25 +85
Unit
V
V
V
°C
Capacitance (TA = 25°C, f = 1 MHz)
Parameter
Symbol
Test condition
Input capacitance
Input / Output capacitance
CIN VIN = 0 V
CI/O
VI/O = 0 V
Remarks 1. VIN : Input voltage
VI/O : Input / Output voltage
2. These parameters are not 100% tested.
MIN.
TYP.
MAX.
8
10
Unit
pF
pF
Data Sheet M14464EJ5V0DS
5
5 Page 
µPD444012A-X
5 Write Cycle (1/2) (B version)
Parameter
Symbol VCC ≥ 3.0 V
VCC ≥ 2.7 V
Unit Condition
µPD444012A µPD444012A µPD444012A µPD444012A µPD444012A
-B55X
-B55X
-B70X
-B85X
-B10X
MIN. MAX. MIN. MAX. MIN. MAX. MIN. MAX. MIN. MAX.
Write cycle time
tWC 50 55 70 85 100 ns
/CE1 to end of write
tCW1
45
50
55
70
80 ns
CE2 to end of write
tCW2
45
50
55
70
80 ns
/LB, /UB to end of write
tBW 45 50 55 70 80 ns
Address valid to end of write
tAW 45
50
55
70
80 ns
Address setup time
tAS 0 0 0 0 0 ns
Write pulse width
tWP 40 45 50 55 60 ns
Write recovery time
tWR 0 0 0 0 0 ns
Data valid to end of write
tDW 25 25 30 35 40 ns
Data hold time
tDH 0 0 0 0 0 ns
/WE to output in high impedance tWHZ 20 20 25 30 35 ns Note
Output active from end of write
tOW 5
5
5
5
5 ns
Note The output load is 1TTL + 5 pF.
Write Cycle (2/2) (C version)
Parameter
Symbol
µPD444012A
-C70X
MIN. MAX.
Write cycle time
tWC 70
/CE1 to end of write
tCW1
55
CE2 to end of write
tCW2
55
/LB, /UB to end of write
tBW 55
Address valid to end of write
tAW 55
Address setup time
tAS 0
Write pulse width
tWP 50
Write recovery time
tWR 0
Data valid to end of write
tDW 30
Data hold time
tDH 0
/WE to output in high impedance tWHZ
25
Output active from end of write tOW 5
VCC ≥ 2.2 V
µPD444012A µPD444012A
-C85X
-C10X
MIN. MAX. MIN. MAX.
85 100
70 80
70 80
70 80
70 80
00
55 60
00
35 40
00
30 35
55
Unit Condition
µPD444012A
-C12X
MIN. MAX.
120 ns
100 ns
100 ns
100 ns
100 ns
0 ns
85 ns
0 ns
60 ns
0 ns
40 ns Note
5 ns
Note The output load is 1TTL + 5 pF.
Data Sheet M14464EJ5V0DS
11
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