74HC393 Datasheet, PDF(10/21 Page) NXP Semiconductors

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74HC393 Datasheet, PDF (10/21 Pages) NXP Semiconductors – Dual 4-bit binary ripple counter

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NXP Semiconductors

74HC393; 74HCT393

Dual 4-bit binary ripple counter

Table 7. Dynamic characteristics â¦continued

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

Symbol Parameter Conditions

25 ï°C

ï40 ï°C to +85 ï°C ï40 ï°C to +125 ï°C Unit

Min Typ Max Min

Max

Min

Max

CPD

power

CL = 50 pF; f = 1 MHz;

[3] -

25 -

dissipation VI = GND to VCC

capacitance

[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 ïW).

PD = CPD ï´ VCC2 ï´ fi ï´ N + ï¥(CL ï´ VCC2 ï´ 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;

ï¥(CL ï´ VCC2 ï´ fo) = sum of outputs.

10.1 Waveforms

input nCP

GND

VOH

output nQx

VOL

1/ f max

t PHL

t THL

t PLH

t TLH

001aad537

Fig 9.

Measurement points are given in Table 8.

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

frequency

Table 8. Measurement points

Type

74HC393

74HCT393

Input

0.5VCC

1.3 V

Output

0.5VCC

1.3 V

74HC_HCT393

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 4 â 16 May 2013

10 of 21

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