TC1270AMVRCTR datasheet(5/40 Pages) MICROCHIP

5 / 40 page

DS22035B-page 5

TC1270A/70AN/71A

1.1.2

TIMING DIAGRAMS AND SPECIFICATIONS

FIGURE 1-2:

MR PIN AND RESET PIN WAVEFORM

FIGURE 1-3:

DEVICE VOLTAGE AND RESET PIN (ACTIVE LOW) WAVEFORM

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

DD to Reset Delay

tRD

—50

—

µs

VDD = VTRIP(MAX) to

VTRIP(MIN) –125 mV

Reset Active

Timeout

Period

TC127XAxBVyy (3)

tRST

1.09

2.19

4.38

VDD = VTRIP(MAX)

TC127XAxCVyy (3)

17.5

VDD = VTRIP(MAX)

TC127XAxVyy (3)

140

280

560

VDD = VTRIP(MAX)

MR Minimum Pulse Width

tMR

—

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.

RST output for TC1270A, RST output for TC1271A.

TC127XA refers to either the TC1270A, TC1270AN or TC1271A device. “x” indicated the selected Voltage

Trip Point, while “yy” indicates the package code.

RST

tRST

tMR

RST

tMD

tMRNI

VTRIP(MAX)

VTRIP(MIN)

VDD

VTRIP

tRST

RST(1)

RST

tRST

tRD

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.

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