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參數(shù)資料
| 型號(hào)： | SA56600-42 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | System reset for lithium battery backup |
| 中文描述： | 系統(tǒng)復(fù)位備用鋰電池 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 141K |
| 代理商： | SA56600-42 |
Philips Semiconductors
Product data
SA56600-42
System reset for lithium battery back-up
2
2001 Jun 19
853–2249 26559
GENERAL DESCRIPTION
The SA56600-42 is designed to protect SRAM data in computer
systems during periods of sagging power supply voltages and power
outages. When the power supply voltage drops to typically 4.2 V, the
CS output goes to a logic LOW state pulling CE to a LOW state,
disabling the SRAM device. In addition, a reset logic LOW is asserted
for system use. If the supply voltage drops further, to 3.3 V typically
or lower, the SA56600-42 switches the system’s operation from the
main power supply source to the Lithium back-up battery. As the
main supply is restored and the voltage rises to 3.3 V or higher, the
SRAM support voltage transfers from the Lithium back-up battery to
the main supply. When the main supply voltage rises to greater than
typically 4.2 V, the CS output goes to a logic HIGH state for SRAM
CE control. Reset assertion is released and normal operation is
resumed. This sequence ensures reliable preservation of SRAM
data during periods of supply deficiency and interruptions.
The SA56600-42 is offered in the SO8 surface mount package.
FEATURES
Supply switching at 4.2 V
DC
threshold (falling supply)
RESET output
Both CS and CS outputs available for SRAM control
During battery back-up operation:
–
Low supply current (0.3
μ
A typical)
–
Low input/output voltage drop (0.3 V typical at 100
μ
A)
–
Low reverse current leakage (0.1
μ
A max.)
During normal operation:
–
Low input/output voltage drop (0.2 V typical at 50 mA)
–
4.8 V typical output voltage at 50 mA with V
CC
= 5.0 V
–
Restoration of main supply operation at 3.3 V
APPLICATIONS
Memory cards (SRAM)
PCs, word processors
FAX machines, photocopiers, office equipment
Sequence controllers
Video games and other equipment with SRAM
SIMPLIFIED SYSTEM DIAGRAM
SL01277
LITHIUM
BATTERY
R
V
DD
V
CC
R
PU
2
4
V
BATT
CE
GND
3
CS
5
CS
SA56600-42
SRAM
6
V
OUT
7
Y
4.2 V
DETECTION
CITCUIT
3.3 V
DETECTION
CITCUIT
8
V
CC
GND
1
RESET
Figure 1. Simplified system diagram.
ORDERING INFORMATION
TYPE NUMBER
PACKAGE
NAME
SO8
TEMPERATURE
RANGE
DESCRIPTION
plastic small outline package; 8 leads; body width 3.9 mm
SA56600-42D
–40 to +85
°
C
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