74HC125PW datasheet(7/17 Pages) NXP

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74HC_HCT125

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Product data sheet

Rev. 4 — 10 January 2013

7 of 17

NXP Semiconductors

74HC125; 74HCT125

Quad buffer/line driver; 3-state

[1]

tpd is the same as tPLH and tPHL.

[2]

ten is the same as tPZH and tPZL.

[3]

tdis is the same as tPLZ and tPHZ.

[4]

tt is the same as tTHL and tTLH.

[5]

CPD is used to determine the dynamic power dissipation (PD in W).

PD =CPD  VCC2  fi  N+ (CL  VCC2  fo) where:

fi = input frequency in MHz;

fo = output frequency in MHz;

CL = output load capacitance in pF;

VCC = supply voltage in V;

N = number of inputs switching;

(C

L  VCC

 f

o) = sum of outputs.

11. Waveforms

For type 74HCT125

tpd

propagation

delay

nA to nY; see Figure 5

[1]

VCC = 4.5 V

VCC =5V; CL =15pF

ten

enable time

nOE to nY; see Figure 6

[2]

VCC = 4.5 V

tdis

disable time

nOE to nY; see Figure 6

[3]

VCC = 4.5 V

transition

time

nY; see Figure 5

[4]

CPD

power

dissipation

capacitance

CL =50pF;f= 1 MHz;

VI =GND to VCC

[5]

-24

Table 7.

Dynamic characteristics …continued

Voltages are referenced to GND (ground = 0 V); CL = 50 pF unless otherwise specified; for test circuit see Figure 7.

Symbol Parameter

Conditions

C

40 C to +85 C 40 C to +125 C Unit

Min

Typ

Max

Min

Max

Min

Max

Measurement points are given in Table 8.

VOL and VOH are typical voltage output levels that occur with the output load.

Fig 5.

Propagation delay input (nA) to output (nY)

90 %

10 %

nA input

nY output

GND

VOH

VOL

tTHL

tTLH

tPHL

tPLH

aaa-003130

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