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x 16-bit. HM6216255HI Datasheet |
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HM6216255HI Series
4M high Speed SRAM (256-kword × 16-bit)
ADE-203-1037A (Z)
Rev. 1.0
Apr. 15, 1999
Description
The HM6216255HI Series is a 4-Mbit high speed static RAM organized 256-k word × 16-bit. It has realized
high speed access time by employing CMOS process (4-transistor + 2-poly resistor memory cell) and high
speed circuit designing technology. It is most appropriate for the application which requires high speed, high
density memory and wide bit width configuration, such as cache and buffer memory in system. It is packaged
in 400-mil 44-pin plastic SOJ and 400-mil 44-pin plastic TSOPII.
Features
• Single 5.0 Vsupply : 5.0 V ± 10 %
• Access time: 12/15 ns (max)
• Completely static memory
No clock or timing strobe required
• Equal access and cycle times
• Directly TTL compatible
All inputs and outputs
• Operating current: 200/180 mA (max)
• TTL standby current: 60/50 mA (max)
• CMOS standby current: 5 mA (max)
• Center VCC and VSS type pinout
• Temperature range: –40 to 85°C
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HM6216255HI Series
Ordering Information
Type No.
HM6216255HJPI-12
HM6216255HJPI-15
HM6216255HTTI-12
HM6216255HTTI-15
Access time
12 ns
15 ns
12 ns
15 ns
Pin Arrangement
HM6216255HJPI Series
A0 1
A1 2
A2 3
A3 4
A4 5
CS 6
I/O1 7
I/O2 8
I/O3 9
I/O4 10
VCC
VSS
I/O5
11
12
13
I/O6 14
I/O7 15
I/O8 16
WE 17
A5 18
A6 19
A7 20
A8 21
A9 22
44 A17
43 A16
42 A15
41 OE
40 UB
39 LB
38 I/O16
37 I/O15
36 I/O14
35 I/O13
34 VSS
33 VCC
32 I/O12
31 I/O11
30 I/O10
29 I/O9
28 NC
27 A14
26 A13
25 A12
24 A11
23 A10
(Top View)
Package
400-mil 44-pin plastic SOJ (CP-44D)
400-mil 44-pin plastic TSOPII (TTP-44DE)
HM6216255HTTI Series
A0
A1
A2
A3
A4
CS
I/O1
I/O2
I/O3
I/O4
VCC
VSS
I/O5
I/O6
I/O7
I/O8
WE
A5
A6
A7
A8
A9
1 44
2 43
3 42
4 41
5 40
6 39
7 38
8 37
9 36
10 35
11 34
12 33
13 32
14 31
15 30
16 29
17 28
18 27
19 26
20 25
21 24
22 23
(Top View)
A17
A16
A15
OE
UB
LB
I/O16
I/O15
I/O14
I/O13
VSS
VCC
I/O12
I/O11
I/O10
I/O9
NC
A14
A13
A12
A11
A10
2
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Pin Description
Pin name
A0 to A17
I/O1 to I/O16
CS
OE
WE
Function
Address input
Data input/output
Chip select
Output enable
Write enable
HM6216255HI Series
Pin name
UB
LB
VCC
VSS
NC
Function
Upper byte select
Lower byte select
Power supply
Ground
No connection
Block Diagram
(LSB) A1
A17
A7
A11
A16
A2
A6
(MSB)A5
I/O...1
I/O8
I/O...9
I/O16
WE
CS
LB
UB
OE
Row
decoder
Memory matrix
256 rows × 8 columns ×
128 blocks × 16 bit
(4,194,304 bits)
Internal
voltage
generater
VCC
VSS
CS
Input
data
control
Column I/O
Column decoder
CS
A10 A8 A9 A12 A13 A14 A0 A15 A3 A4
CS
3
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