Electrical Characteristics: continued
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
■
RESET
Threshold
HIGH VR(HI)
VOUT increasing
4.65
4.50
150
4.90
4.70
200
VOUT - 0.05
V
LOW VR(LOW)
VOUT decreasing
(HIGH - LOW)
VOUT ³ VR(HI)
4.90
250
25
V
Threshold Hysteresis(VRH
)
mV
µA
Reset Output Leakage
= HIGH
RESET
Output Voltage
Low(VL(LOW)
)
1V ² VOUT ² VR(LOW)
Rp = 2.7k½*
VOUT, Power up, Power down
0.1
0.6
0.4
1.0
V
V
Low (VRpeak
)
Delay Times
tPOR
CDELAY = 0.1µF
30.0
0.5
47.5
1.0
65.0
1.5
ms
ms
tWDI(
)
RESET
■ Watchdog
Input Voltage
HIGH
2.0
V
V
LOW
0.8
10
Input Current
WDI ² VOUT
DELAY = 0.1µF
0
µA
Threshold Frequency
C
fWDI
fWDI(UPPER)**
64
218
77
262
96
326
Hz
Hz
LOWER
* R is connected to
and V
.
RESET
P
OUT
** CS8140 only
To observe safe operating junction temperature, low duty cycle pulse testing is used on tests where applicable.
Package Lead Description
Package Lead #
Lead Symbol
Function
7 Lead
TO-220
24 Lead *
SOIC Wide
14 Lead
PDIP
1
21
12
VIN
Supply voltage to IC, usually direct from the battery.
2
23
13
ENABLE
CMOS compatible logical input. VOUT is disabled when
ENABLE is LOW and WDI is beyond its preset limits.
3
24
14
CMOS compatible output lead.
VOUT drops below 4.5% of its typical value for more than
2µs or WDI signal falls outside itÕs window limits.
goes low whenever
RESET
RESET
4
5
6
12, 20
11
1
Gnd
Ground connection.
2
3
Delay
WDI
Timing capacitor for Watchdog and
functions.
RESET
2
CMOS compatible input lead. The Watchdog function mon-
itors the falling edge of the incoming digital pulse train. The
signal is usually generated by the system microprocessor.
7
4
5
3
4
VOUT
Regulated output voltage, 5V (typ).
N/A
Sense
Kelvin connection which allows remote sensing of output
voltage for improved regulation.
1,6-11,13-19,22
5-10
NC
No connection.
* The CS8141 uses a fused lead package. Leads 6-8 and 17-19 are fused together through the lead frame. These leads are
electrically connected to IC ground and should be connected to system ground for a good thermal connection.
3
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
