U636H04DC25 Просмотр технического описания (PDF) - Zentrum Mikroelektronik Dresden AG
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U636H04DC25 Datasheet PDF : 11 Pages
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Preliminary
U636H04
PowerStore 512 x 8 nvSRAM
Features
F High-performance CMOS non-
volatile static RAM 512 x 8 bits
F 25 and 45 ns Access Times
F 12 and 25 ns Output Enable
Access Times
F ICC = 15 mA at 200 ns Cycle Time
F Unlimited Read and Write to
F SRAM
Automatic STORE to EEPROM
on Power Down using system
capacitance
F Automatic STORE Timing
F 105 STORE cycles to EEPROM
F 10 years data retention in
EEPROM
F Automatic RECALL on Power Up
F Unlimited RECALL cycles from
EEPROM
F Single 5 V ± 10 % Operation
F Operating temperature ranges:
0 to 70 °C
-40 to 85 °C
F CECC 90000 Quality Standard
F ESD characterization according
F MIL STD 883C M3015.7-HBM
Packages: PDIP24 (600 mil)
SOP24 (300 mil)
Description
The U636H04 has two separate
modes of operation: SRAM mode
and nonvolatile mode.
In SRAM mode, the memory ope-
rates as an ordinary static RAM. In
nonvolatile operation, data is trans-
ferred in parallel from SRAM to
EEPROM or from EEPROM to
SRAM.
In this mode SRAM functions are
disabled.
The U636H04 is a fast static RAM
(25 and 45 ns), with a nonvolatile
electrically erasable PROM
(EEPROM) element incorporated
in each static memory cell. Data
transfers from the SRAM to the
EEPROM (the STORE operation)
take place automatically upon
power down using charge stored in
system capacitance. Transfers
from the EEPROM to the SRAM
(the RECALL operation) take place
automatically on power up.
The SRAM can be read and written
an unlimited number of times, while
independent nonvolatile date resi-
des in EEPROM.
The U636H04 combines the high
performance and ease of use of a
fast SRAM with nonvolatile data
integrity.
Pin Configuration
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
1
24
2
23
3
22
4
21
5
20
6 PDIP 19
7 SOP 18
8
17
9
16
10
15
11
14
12
13
VCC
A8
n.c.
W
G
n.c.
E
DQ7
DQ6
DQ5
DQ4
DQ3
Top View
December 12, 1997
Pin Description
Signal Name
A0 - A8
DQ0 - DQ7
E
G
W
VCC
VSS
Signal Description
Address Inputs
Data In/Out
Chip Enable
Output Enable
Write Enable
Power Supply Voltage
Ground
1
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