CS8151
Electrical Characteristics: continued
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
s
WATCHDOG Input
Threshold
HIGH
LOW
Hysteresis
Input Current
Pulse Width
0 < WDI < 6V
50% WDI falling edge to
50% WDI rising edge and
50% WDI rising edge to 50%
WDI falling edge (see Figure 1)
1.4
1.3
100
0
+10
2.0
V
V
mV
µA
µs
0.8
25
-10
5
s
WAKE UP Output
WAKE UP Period
WAKE UP Duty Cycle nominal
RESET HIGH to WAKE UP
Rising Delay Time
WAKE UP Response
to Watchdog Input
WAKE UP Response
to RESET
Output
LOW
HIGH
Current Limit
see Figure 1a
see Figure 1c
50% RESET rising edge to
50% WAKE UP edge
(see Figure 1)
50% WDI falling edge to
50% WAKE UP falling edge
50% RESET falling edge to
50% WAKE UP falling edge
V
OUT
= 5V®4.5V
I
OUT
= 25µA(sinking)
I
OUT
= 25µA(sourcing)
WAKE UP = 5V
WAKE UP = 0V
Package Lead Description
Package Lead #
Lead Symbol
Function
30
40
15
40
50
20
50
60
25
ms
%
ms
2
2
10
10
µs
µs
3.8
0.025
.05
0.2
4.2
1.00
0.8
5.1
7.00
3.50
V
V
mA
mA
7L TO-220 &
7L D
2
PAK
2
3
4
7
6
16 L PDIP
9
11
4,5,12,13
16
15
16L SOIC
9
11
4,5,6,12,13
16
15
V
IN
WDI
Gnd
Delay
RESET
Supply voltage to the IC.
CMOS/TTL compatible input lead. The watchdog function
monitors the falling edge of the incoming signal.
Ground Connection
Input lead from timing capacitor for RESET and WAKE UP
signal.
CMOS/TTL compatible output lead RESET goes low when-
ever V
OUT
drops by more than 6% from nominal, or during
the absence of a correct watchdog signal.
CMOS/TTL compatible output consisting of a continuously
generated signal used to WAKE UP the microprocessor from
sleep mode.
Regulated output voltage 5V ± 2%.
Kelvin connection which allows remote sensing of the output
voltage for improved regulation. If remote sensing is not
required, connect to V
OUT
.
3
(internally fused) (internally fused)
5
14
14
WAKE UP
1
8
7
8
7
V
OUT
Sense
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
