U635H16 데이터 시트보기 (PDF) - Zentrum Mikroelektronik Dresden AG
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U635H16 Datasheet PDF : 13 Pages
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U635H16
Features
F High-performance CMOS non-
volatile static RAM 2048 x 8 bits
F 25, 35 and 45 ns Access Times
F 12, 20 and 25 ns Output Enable
Access Times
F ICC = 15 mA at 200 ns Cycle Time
F Automatic STORE to EEPROM
on Power Down using system
F capacitance
Software initiated STORE
(STORE Cycle Time < 10 ms)
F Automatic STORE Timing
F 105 STORE cycles to EEPROM
F 10 years data retention in
EEPROM
F Automatic RECALL on Power Up
F Software RECALL Initiation
F (RECALL Cycle Time < 20 µs)
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
MIL STD 883C M3015.7-HBM
(classification see IC Code
Numbers)
PowerStore 2K x 8 nvSRAM
F Packages: PDIP24 (600 mil)
SOP24 (300 mil)
Description
The U635H16 has two separate
modes of operation: SRAM mode
and nonvolatile mode. In SRAM
mode, the memory operates as an
ordinary static RAM. In nonvolatile
operation, data is transferred in
parallel from SRAM to EEPROM or
from EEPROM to SRAM. In this
mode SRAM functions are disab-
led.
The U635H16 is a fast static RAM
(25, 35, 45 ns), with a nonvolatile
electrically erasable PROM
(EEPROM) element incorporated
in each static memory cell. The
SRAM can be read and written an
unlimited number of times, while
independent nonvolatile data resi-
des in EEPROM. 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 U635H16 combines the high
performance and ease of use of a
fast SRAM with nonvolatile data
integrity.
STORE cycles also may be initiated
under user control via a software
sequence.
Once a STORE cycle is initiated,
further input or output are disabled
until the cycle is completed.
Because a sequence of addresses
is used for STORE initiation, it is
important that no other read or write
accesses intervene in the sequence
or the sequence will be aborted.
RECALL cycles may also be initia-
ted by a software sequence.
Internally, RECALL is a two step
procedure. First, the SRAM data is
cleared and second, the nonvolatile
information is transferred into the
SRAM cells.
The RECALL operation in no way
alters the data in the EEPROM
cells. The nonvolatile data can be
recalled an unlimited number of
times.
Pin Configuration
Pin Description
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
24
18
8
17
9
16
10
15
11
14
12
13
VCC
A8
A9
W.
G
A10
E
DQ7
DQ6
DQ5
DQ4
DQ3
Top View
Signal Name
A0 - A10
DQ0 - DQ7
E
G
W
VCC
VSS
Signal Description
Address Inputs
Data In/Out
Chip Enable
Output Enable
Write Enable
Power Supply Voltage
Ground
December 12, 1997
93
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