SP791 データシートの表示（PDF） - Signal Processing Technologies
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SP791 Datasheet PDF : 19 Pages
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ELECTRICAL CHARACTERISTICS (continued)
(Vcc = 4.75V to 5.5V, VBATT = 2.8V, TA = TMIN to TMAX unless otherwise noted, typicals specified at 25oC)
PARAMETER
MIN
TYP
WDI Threshold Voltage
(Note 4)
0.75 X V
CC
WDI Input Current
-50
-10
20
POWER FAIL COMPARATOR
PFI Input Threshold
1.20
1.25
PFI Leakage Current
+0.01
PFO Output Voltage
3.5
PFO Short-Circuit Current
60
1
15
PFI-to-PFO Delay
15
55
CHIP-ENABLE GATING
CE IN Leakage Current
+0.005
CE IN-to-CE OUT Resistance
65
(Note 5)
CE OUT Short-Circuit Current
(Reset Active)
0.1
0.75
CE IN-to-CE OUT Propagation
6
Delay (Note 6)
CE OUT Output Voltage High
3.5
(Reset Active)
2.7
RESET-to-CE OUT Delay
15
MANUAL RESET INPUT
MR Minimum Pulse Width
25
15
MR-to-RESET
7
Propagation Delay
MR Threshold
1.25
MR Pull-Up Current
23
MAX UNITS
VV
IH
0.8
VIL
µA WDI = 0V
50
WDI = VOUT
CONDITIONS
1.30
+25
0.4
100
V
nA
V
mA
µA
µs
VCC = 5V
ISINK = 3.2mA
ISOURCE = 1µA, VCC = 5V
Output sink current
Output source current
VOD = 15mV
VOD = 15mV
+1
µA Disabled mode
150
Ω
Enabled mode
2.0
mA Disabled mode, CE OUT = 0V
10
ns 50Ω source impedance driver,
CLOAD = 50pF
V
VCC = 5V, IOUT = 100µA
VCC = 0V, VBATT = 2.8V, IOUT = 1µA
µs Power down
µs
µs
V
VCC = 5V
250
µA MR = 0V
Note 1: Either VCC or VBATT can go to 0V, if the other is
greater than 2.0V.
Note 2: The supply current drawn by the SP791 from the
battery (excluding IOUT) typically goes to 10µA when (VBATT
- 1V) < V < V . In most applications, this is a brief
CC
BATT
period as V falls through this region.
CC
Note 3: "+" = battery-discharging current,
"-" = battery-charging current.
Note 4: WDI is internally connected to a voltage divider
between VOUT and GND. If unconnected, WDI is driven to
1.6V (typ), disabling the watchdog function.
Note 5: The chip-enable resistance is tested with VCC =
4.75V :: VCE IN = VCE OUT =VCC/2.
Note 6: The chip-enable propagation delay is measured
from the 50% point at CE IN to the 50% point at CE OUT.
SP791DS/08
SP791 Low Power Microprocessor Supervisory with Battery Switch-Over
4
© Copyright 2000 Sipex Corporation
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