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BQ4011YMA-70 Datasheet

  • BQ4011YMA-70

  • 32Kx8 Nonvolatile SRAM

  • 11頁

  • TI

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bq4011/bq4011Y
32Kx8 Nonvolatile SRAM
Features
廬
Data retention in the absence of
power
廬
Automatic write-protection
during power-up/power-down
cycles
廬
Industry-standard 28-pin 32K x
8 pinout
廬
Conventional SRAM operation;
unlimited write cycles
廬
10-year minimum data retention
in absence of power
廬
Battery internally isolated until
power is applied
General Description
The CMOS bq4011 is a nonvolatile
262,144-bit static RAM organized as
32,768 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
V
CC
falls out of tolerance, the SRAM
is unconditionally write-protected to
prevent inadvertent write operation.
At this time the integral energy
source is switched on to sustain the
memory until after V
CC
returns valid.
The bq4011 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 bq4011 requires no external cir-
cuitry and is socket-compatible with
industry-standard SRAMs and most
EPROMs and EEPROMs.
Pin Connections
Pin Names
A
0
鈥揂
14
DQ
0
鈥揇Q
7
CE
OE
WE
V
CC
V
SS
Address inputs
Data input/output
Chip enable input
Output enable input
Write enable input
+5 volt supply input
Ground
Block Diagram
Selection Guide
Part
Number
Maximum
Access
Time (ns)
Negative
Supply
Tolerance
Part
Number
bq4011Y-70
bq4011 -100
bq4011 -150
bq4011 -200
Aug. 1993 C
Maximum
Access
Time (ns)
70
100
150
200
Negative
Supply
Tolerance
-10%
-10%
-10%
-10%
100
150
200
-5%
-5%
-5%
bq4011Y -100
bq4011Y -150
bq4011Y -200
1

BQ4011YMA-70 產(chǎn)品屬性

  • 14

  • 集成電路 (IC)

  • 存儲(chǔ)器

  • -

  • RAM

  • NVSRAM（非易失 SRAM）

  • 256K (32K x 8)

  • 70ns

  • 并聯(lián)

  • 4.5 V ~ 5.5 V

  • 0°C ~ 70°C

  • 28-DIP 模塊（0.61"，15.49mm）

  • 28-DIP 模塊（18.42x37.72）

  • 托盤

  • 296-9393-5

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