Diodes 74AHCT594 - Manual (Page 3)

74AHCT594
Document number: DS35485 Rev. 2 - 2
3 of 10
www.diodes.com
June 2013
© Diodes Incorporated
74AHCT594
Functional Description and Timing Diagram
Control Input Output
Function
SHR STR SHCP STCP DS Q7S Qn
L X X X X L NC Clear Shift Register
X L X X X NC L Clear Storage Register
H X  L H or L Q6S NC Loads DS into shift register stage 0. All Q
S
shifted
H H X  X NC Qs Contents of shift register moved to starge register all Q
S
-> Q
N
H H   H or L Q6S QnS Shift Register one pulse count ahead of storage register.
H=HIGH voltage state
L=LOW voltage state
=LOW to HIGH transition
X= don’t care – high or low (not floating)
NC= No change
Absolute Maximum Ratings
(Note 4) (@T A = +25°C, unless otherwise specified.)
Symbol Parameter Rating Unit
ESD HBM Human Body Model ESD Protection 2 KV
ESD CDM Charged Device Model ESD Protection 1 KV
ESD MM Machine Model ESD Protection 200 V
V
CC
Supply Voltage Range -0.5 to +7.0 V
V
I
Input Voltage Range -0.5 to +7.0 V
V
o
Voltage applied to output in high or low state -0.3 to V
CC
+0.5 V
I
IK
Input Clamp Current V
I
< -0.5V -20 mA
I
OK
Output Clamp Current V
O
<-0.5V -20 mA
I
OK
Output Clamp Current V
O
> V
CC
+0.5V 20 mA
I
O
Continuous output current ±25 mA
I
CC
Continuous current through Vcc 75 mA
I
GND
Continuous current through GND -75 mA
T
J
Operating Junction Temperature -40 to +150 °C
T
STG
Storage Temperature -65 to +150 °C
P
TOT
Total Power Dissipation 500 mW
Notes: 4. Stresses beyond the absolute maximum may result in immediate failure or reduced reliability. These are stress values and device
operation should be within recommend values.