bq4013/Y
128Kx8 Nonvolatile SRAM
-
➤ Data retention for at least 10
years without power
➤ Automatic write-protection during
power-up/power-down cycles
➤ Conventional SRAM operation,
including unlimited write cycles
➤ Internal isolation of battery before power application
➤ Industry standard 32-pin DIP
pinout
➤ 34-pin LIFETIME LITHIUM™
module
-
Module completely
surface-mounted
Snap-on power-source for
lithium battery backup
prevent inadvertent write operation.
-
Features
Replaceable power-source
(part number: bq40MS)
At this time the integral energy
source is switched on to sustain the
memory until after VCC returns valid.
General Description
The CMOS bq4013/Y is a nonvolatile
1,048,576-bit static RAM organized as
131,072 words by 8 bits. The integral
control circuitry and lithium energy
source provide reliable nonvolatility
coupled with the unlimited write cycles of standard SRAM.
The control circuitry constantly
monitors the single 5V supply for an
out-of-tolerance condition. When
VCC falls out of tolerance, the SRAM
is unconditionally write-protected to
Pin Connections
The bq4013/Y uses an extremely
low standby current CMOS SRAM,
coupled with a small lithium coin
cell to provide nonvolatility without
long write-cycle times and the
write-cycle limitations associated
with EEPROM.
The bq4013/Y requires no external
circuitry and is socket-compatible
with industry-standard SRAMs and
most EPROMs and EEPROMs.
Pin Names
A0–A16
DQ0–DQ7
NC
A15
A16
NC
VCC
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
NC
NC
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
Address inputs
Data input/output
CE
Chip enable input
OE
Output enable input
WE
Write enable input
NC
No connect
VCC
Supply voltage input
VSS
Ground
34-Pin LIFETIME LITHIUM Module
PN4013Ygs.eps
Selection Guide
Part
Number
Maximum
Access
Time (ns)
Negative
Supply
Tolerance
Part
Number
bq4013Yx -70
Maximum
Access
Time (ns)
Negative
Supply
Tolerance
70
-10%
bq4013x -85
85
-5%
bq4013Yx -85
85
-10%
bq4013x -120
120
-5%
bq4013Yx -120
120
-10%
Note: x = MA for PDIP module or MS for LIFETIME LITHIUM module.
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