74ABT244CSJ datasheet(7/13 Pages) FAIRCHILD

Numer części	74ABT244CSJ

Szczegółowy opis	Octal Buffer/Line Driver with 3-STATE Outputs

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74ABT244 Rev. 1.4

7

Skew

Notes:

12. 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). The specification is guaranteed

but not tested.

13. 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.

14. 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.)

15. These specifications guaranteed but not tested. The limits represent propagation delays with 250pF load capacitors

in place of the 50pF load capacitors in the standard AC load.

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.

Capacitance

Note:

17. COUT is measured at frequency f = 1MHz, per MIL-STD-883, Method 3012.

Symbol

Parameter

TA = –40°C to +85°C,

VCC = 4.5V–5.5V,

CL = 50pF,

8 Outputs Switching(14)

TA = –40°C to +85°C,

VCC = 4.5V–5.5V,

CL = 250pF,

8 Outputs Switching(15)

Units

Max.

tOSHL

(12)

Pin to Pin Skew,

HL Transitions

0.8

1.8

ns

tOSLH

(12)

Pin to Pin Skew,

LH Transitions

0.8

1.8

ns

tPS

(16)

Duty Cycle, LH–HL Skew

1.0

2.5

ns

tOST

(12)

Pin to Pin Skew,

LH/HL Transitions

1.0

2.5

ns

tPV

(13)

Device to Device Skew,

LH/HL Transitions

1.5

3.0

ns

Symbol

Parameter

Conditions

TA = 25°C

Typ.

Units

CIN

Input Capacitance

VCC = 0V

5.0

pF

COUT

(17)

Output Capacitance

VCC = 5.0V

9.0

pF

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