HD74HCT74A Datasheet, PDF (6/10 Pages) Hitachi Semiconductor – Dual D-type Positive Edge-triggered Flip Flops with Clear and Preset

HD74HCT74A
Test Circuit
1) f_max , t _PLH ,t _PHL (CLK → Q, Q)
Input
Pulse Generator
Z_out = 50 Ω
Input
V_CC V_CC
PR
D
Q
Pulse Generator
Z_out = 50 Ω
CLK
Q
CLR
2) t_PLH ,t _PHL (CLR or PR → Q, Q)
Input
Pulse Generator
Zout = 50 Ω
V_CC
PR
D
Q
Input
Pulse Generator
Zout = 50 Ω
CLK
Q
CLR
Output Q
C_L
Output Q
C_L
Output Q
C_L
Output Q
C_L
Notes: 1. C _L includes probe and jig capacitance.
2. Test is put into the each flip flops.
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