74HCT393D datasheet(10/21 Pages) NXP

10 / 21 page

74HC_HCT393

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Product data sheet

Rev. 4 — 16 May 2013

10 of 21

NXP Semiconductors

74HC393; 74HCT393

Dual 4-bit binary ripple counter

[1]

tpd is the same as tPLH and tPHL.

[2]

tt is the same as tTHL and tTLH.

[3]

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.

10.1 Waveforms

CPD

power

dissipation

capacitance

CL =50pF;f=1 MHz;

VI =GND to VCC

[3]

-25

Table 7.

Dynamic characteristics …continued

Voltages are referenced to GND (ground = 0 V); CL = 50 pF unless otherwise specified; for test circuit see Figure 11.

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.

Fig 9.

Propagation delays clock (nCP) to output (nQx), the output transition times and the maximum clock

frequency

001aad537

tPLH

tTLH

tTHL

tPHL

input nCP

GND

VOH

VOL

1/fmax

output nQx

Table 8.

Measurement points

Type

Input

Output

74HC393

0.5VCC

74HCT393

1.3 V

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