74ABT16646CSSC datasheet(7/9 Pages) FAIRCHILD

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Skew

(SOIC Package)

Note 13: This specification is guaranteed but not tested. The limits apply to propagation delays for all paths described switching in phase

(i.e., all LOW-to-HIGH, HIGH-to-LOW, etc.).

Note 14: This specification is guaranteed but not tested. The limits represent propagation delays with 250 pF load capacitors in place of the 50 pF load

capacitors in the standard AC load.

Note 15: Skew is defined as the absolute value of the difference between the actual propagation delays for any two separate outputs of the same device.

The specification applies to any outputs switching HIGH to LOW (tOSHL), LOW to HIGH (tOSLH), or any combination switching LOW to HIGH and/or HIGH to

LOW (tOST). This specification is guaranteed but not tested.

Note 16: This describes the difference between the delay of the LOW-to-HIGH and the HIGH-to-LOW transition on the same pin. It is measured across all

the outputs (drivers) on the same chip, the worst (largest delta) number is the guaranteed specification. This specification is guaranteed but not tested.

Note 17: Propagation delay variation for a given set of conditions (i.e., temperature and VCC) from device to device. This specification is guaranteed but not

tested.

Capacitance

Note 18: CI/O is measured at frequency, f = 1 MHz, per MIL-STD-883, Method 3012.

Symbol

Parameter

TA = −40°C to +85°CTA = −40°C to +85°C

Units

VCC = 4.5V–5.5V

CL = 50 pF

CL = 250 pF

16 Outputs Switching

(Note 13)

(Note 14)

Max

tOSHL

Pin to Pin Skew

2.0

2.5

(Note 15)

HL Transitions

tOSLH

Pin to Pin Skew

2.0

2.5

(Note 15)

LH Transitions

tPS

Duty Cycle

2.0

2.5

(Note 16)

LH–HL Skew

tOST

Pin to Pin Skew

2.8

3.0

(Note 15)

LH/HL Transitions

tPV

Device to Device Skew

3.5

4.0

(Note 17)

LH/HL Transitions

Symbol

Parameter

Typ

Units

Conditions

TA = 25°C

CIN

Input Capacitance

VCC = 0V (non I/O pins)

CI/O (Note 18)

Output Capacitance

VCC = 5.0V (An, Bn)

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