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U634H256CSA35 Datasheet

  • U634H256CSA35

  • NOVRAM|32KX8|CMOS|SOP|32PIN|PLASTIC

  • 14頁

  • ETC

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U634H256xSA
Automotive
PowerStore
32K x 8 nvSRAM
Features
F
High-performance CMOS non-
F
F
F
F
Description
The U634H256xSA has two sepa-
rate modes of operation: SRAM
mode and nonvolatile mode. In
SRAM mode, the memory operates
as an ordinary static RAM. In non-
volatile operation, data is transfer-
red in parallel from SRAM to
EEPROM or from EEPROM to
SRAM. In this mode SRAM
functions are disabled.
The U634H256xSA is a fast static
RAM (35 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 an external
100
碌F
capacitor.
Transfers from the EEPROM to the
SRAM (the RECALL operation)
take place automatically on power
up.
The U634H256xSA combines the
high performance and ease of use
of a fast SRAM with nonvolatile
data integrity.
STORE cycles also may be initia-
ted under user control via a soft-
ware sequence or via a single pin
(HSB).
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 nonvola-
tile 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.
F
F
F
F
F
F
F
F
F
F
F
F
volatile static RAM 32768 x 8 bits
35 ns Access Time
15 ns Output Enable Access Time
I
CC
= 15 mA at 200 ns Cycle Time
Automatic STORE to EEPROM
on Power Down using external
capacitor
Hardware or Software initiated
STORE
(STORE Cycle Time < 10 ms)
Automatic STORE Timing
10
5
STORE cycles to EEPROM
10 years data retention in
EEPROM
Automatic RECALL on Power Up
Software RECALL Initiation
(RECALL Cycle Time < 20
碌s)
Unlimited RECALL cycles from
EEPROM
Single 5 V
鹵
10 % Operation
Operating temperature ranges:
--40 to 125
擄C
CECC 90000 Quality Standard
ESD characterization according
MIL STD 883C M3015.7-HBM
(classification see IC Code
Numbers)
Package: SOP32 (300 mil)
Pin Configuration
Pin Description
VCAP
A14
A12
A7
A6
A5
A4
A3
n.c.
A2
A1
A0
DQ0
DQ1
DQ2
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SOP
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
VCCX
HSB
W
A13
A8
A9
A11
G
n.c.
A10
E
DQ7
DQ6
DQ5
DQ4
DQ3
Signal Name
A0 - A14
DQ0 - DQ7
E
G
W
VCCX
VSS
VCAP
HSB
Signal Description
Address Inputs
Data In/Out
Chip Enable
Output Enable
Write Enable
Power Supply Voltage
Ground
Capacitor
Hardware Controlled Store/Busy
Top View
April 22, 2002
1

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