hx6408 Honeywell International's Solid State Electronics Center (SSEC), hx6408 Datasheet - Page 2

• Manufacturer Part Number: hx6408
• Description: 512k X 8 Static Ram
• Manufacturer: Honeywell International's Solid State Electronics Center (SSEC)

HX6408
Advanced Information
FUNCTIONAL DIAGRAM
SIGNAL DEFINITIONS
2
An
NWE
NSL
NCS
NOE
A: 0-18
DQ: 0-7
NCS
NWE
NOE
NSL
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Bidirectional data pins, which serve as data outputs during a read operation and as data inputs
during a write operation.
Negative chip select, when at a low level allows normal read or write operation. When at a high level
NCS forces the SRAM to a precharge condition, holds the data output drivers in a high impedance
state. If this signal is not used it must be connected to VSS.
Negative write enable, when at a low level activates a write operation and holds the data output
drivers in a high impedance state. When at a high level NWE allows normal read operation.
Negative output enable, when at a high level holds the data output drivers in a high impedance
state. When at a low level, the data output driver state is defined by NCS, NWE and NSL. This
signal is asynchronous.
Not sleep, when at a high level allows normal operation. When at a low level NSL forces the SRAM
to a precharge condition, holds the data output drivers in a high impedance state and disables all the
input buffers except the NCS and NOE input buffers. If this signal is not used it must be connected
to VDD. This signal is asynchronous. The HX6408 may be ordered without the sleep mode option
and pin 36 is then a NC.
Address input pins, which select a particular eight-bit word within the memory array.
WE • CS
NWE • CS
All controls must be enabled
for signal to pass.
# = number of buffers,
Default = 1
Signal
Memory
Array
#
1 = enabled
Signal
DQ(0:7)
36 LEAD FLAT PACK PINOUT
VSS
NWE 13
NCS
VDD
D2
D3
A0
A1
A2
A3
A4
D0
D1
A5 14
A6 15
A7 16
A8 17
A9 18
10
11
12
1
2
3
4
5
6
7
8
9
Top View
HX6408
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
(NSL)
A18
A17
A16
A15
NOE
D4
D5
VSS
VDD
D6
D7
A14
A13
A12
A11
A10
NAS