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TC1270A Datasheet, PDF (5/40 Pages) Microchip Technology – Voltage Supervisor with Manual Reset Input
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TC1270A/70AN/71A
1.1.2 TIMING DIAGRAMS AND SPECIFICATIONS
FIGURE 1-2:
MR
MR PIN AND RESET PIN WAVEFORM
tMR
RST
tMRNI
tRST
tMD
RST
FIGURE 1-3:
DEVICE VOLTAGE AND RESET PIN (ACTIVE LOW) WAVEFORM
VTRIP
VTRIP(MAX)
VTRIP(MIN)
VDD
1V
tRST
tRD
tRST
RST(1)
RST
VDD < 1V is outside the device operating specification. The RST (or RST) output state is unknown while VDD < 1V.
Note 1: The TC1270AN requires an external pull-up resistor.
TABLE 1-1: RESET AND DEVICE RESET TIMER REQUIREMENTS
Electrical Characteristics: Unless otherwise noted, VDD = 5V for L/M versions, VDD = 3.3V for T/S versions,
VDD = 3V for R version, TA = -40°C to +125°C. Typical values are at TA = +25°C.
Parameter
Sym
Min Typ(1) Max Units
Test Conditions
VDD to Reset Delay
Reset Active
Timeout
Period
TC127XAxBVyy (3)
TC127XAxCVyy (3)
TC127XAxVyy (3)
tRD
tRST
—
50
—
1.09 2.19 4.38
17.5
35
70
140
280
560
µs VDD = VTRIP(MAX) to
VTRIP(MIN) –125 mV
ms VDD = VTRIP(MAX)
ms VDD = VTRIP(MAX)
ms VDD = VTRIP(MAX)
MR Minimum Pulse Width
tMR
10
—
—
µs
MR Noise Immunity
tMRNI
—
0.1
—
µs
MR to Reset Propagation Delay
tMD
—
0.2
—
µs
Note 1: Unless otherwise stated, data in the Typical (“Typ”) column is at 5V, +25°C.
2: RST output for TC1270A, RST output for TC1271A.
3: TC127XA refers to either the TC1270A, TC1270AN or TC1271A device. “x” indicated the selected Voltage
Trip Point, while “yy” indicates the package code.
© 2007 Microchip Technology Inc.
DS22035B-page 5
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