BQ4013_14 Datasheet, PDF (1/15 Pages) Texas Instruments – 128 k ´ 8 NONVOLATILE SRAM (5 V, 3.3 V)

Not Recommended For New Designs
bq4013/Y/LY
www.ti.com
SLUS121A – MAY 1999 – REVISED MAY 2007
128 k × 8 NONVOLATILE SRAM (5 V, 3.3 V)
FEATURES
• 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
• 5-V or 3.3-V Operation
• Industry Standard 32-Pin DIP Pinout
GENERAL DESCRIPTION
The CMOS bq4013/Y/LY 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
supply for an out-of-tolerance condition. When V_CC
falls out of tolerance, the SRAM is unconditionally
write-protected to prevent an inadvertent write
operation.
At this time the integral energy source is switched on
to sustain the memory until after V_CC returns valid.
The bq4013/Y/LY uses extremely low standby
current CMOS SRAMs, coupled with small lithium
coin cells to provide nonvolatility without long
write-cycle times and the write-cycle limitations
associated with EEPROM.
The bq4013/Y/LY requires no external circuitry and is
compatible with the industry-standard 1-Mb SRAM
pinout.
PIN CONNECTIONS
32−Pin DIP Module
(TOP VIEW)
NC ₁
A₁₆ 2
A₁₄ 3
A₁₂ 4
A₇ 5
A₆ 6
A₅ 7
A₄ 8
A₃ 9
A₂ 10
A₁ 11
A₀ 12
DQ₀ 13
DQ₁ 14
DQ₂ 15
V_SS 16
32 V_CC
31 A₁₅
30 NC
29 WE
28 A₁₃
27 A₈
26 A₉
25 A₁₁
24 OE
23 A₁₀
22 CE
21 DQ₇
20 _DQ6
19 _DQ5
18 _DQ4
17 _DQ3
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1999–2007, Texas Instruments Incorporated