74HC74D-T Datasheet, PDF (2/22 Pages) NXP Semiconductors – Dual D-type flip-flop with set and reset; positive-edge trigger

Philips Semiconductors
Dual D-type flip-flop with set and reset;
positive-edge trigger
Product specification
74HC74; 74HCT74
FEATURES
• Wide supply voltage range from 2.0 to 6.0 V
• Symmetrical output impedance
• High noise immunity
• Low power dissipation
• Balanced propagation delays
• ESD protection:
HBM EIA/JESD22-A114-A exceeds 2000 V
MM EIA/JESD22-A115-A exceeds 200 V.
GENERAL DESCRIPTION
The 74HC/HCT74 is a high-speed Si-gate CMOS device
and is pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT74 are dual positive-edge triggered, D-type
flip-flops with individual data (D) inputs, clock (CP) inputs,
set (SD) and reset (RD) inputs; also complementary
Q and Q outputs.
The set and reset are asynchronous active LOW inputs
and operate independently of the clock input. Information
on the data input is transferred to the Q output on the
LOW-to-HIGH transition of the clock pulse. The D inputs
must be stable one set-up time prior to the LOW-to-HIGH
clock transition for predictable operation.
Schmitt-trigger action in the clock input makes the circuit
highly tolerant to slower clock rise and fall times.
QUICK REFERENCE DATA
GND = 0 V; T_amb = 25 °C; t_r = t_f = 6 ns
SYMBOL
PARAMETER
CONDITIONS
t_PHL/t_PLH
f_max
C_I
C_PD
propagation delay
nCP to nQ, nQ
nSD to nQ, nQ
nRD to nQ, nQ
maximum clock frequency
input capacitance
power dissipation capacitance per flip-flop
C_L = 15 pF; V_CC = 5 V
notes 1 and 2
Notes
1. C_PD is used to determine the dynamic power dissipation (P_D in µW).
P_D = C_PD × V_CC2 × f_i × N + Σ(C_L × V_CC2 × f_o) where:
f_i = input frequency in MHz;
f_o = output frequency in MHz;
C_L = output load capacitance in pF;
V_CC = supply voltage in Volts;
N = total load switching outputs;
Σ(C_L × V_CC2 × f_o) = sum of the outputs.
2. For 74HC74 the condition is V_I = GND to V_CC.
For 74HCT74 the condition is V_I = GND to V_CC − 1.5 V.
TYPICAL
HC
HCT
UNIT
14
15
ns
15
18
ns
16
18
ns
76
59
MHz
3.5
3.5
pF
24
29
pF
2003 Jul 10
2