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CD74FCT843A Datasheet, PDF (5/6 Pages) Texas Instruments – BiCMOS FCT Interface Logic, 9-Bit Transparent Latches, Three-State
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CD74FCT843A, CD74FCT844A
Switching Specifications Over Operating Range FCT Series tr, tf = 2.5ns, CL = 50pF, RL (Figure 1)
25oC
0oC TO 70oC
Propagation Delays
PARAMETER
SYMBOL VCC (V) TYP
MIN
MAX
Data to Outputs
CD74FCT843A
tPLH, tPHL
5
6.8
1.5
9
(Note 6)
LE to Outputs
PRE to Outputs
CLR to Outputs
Output Enable Times
Output Disable Times
Power Dissipation Capacitance
CD74FCT844A
tPLH, tPHL
5
7.5
1.5
10
tPLH, tPHL
5
9
1.5
12
tPLH
5
9
1.5
12
tPHL
5
9.8
1.5
13
tPZL, tPZH
-
10.5
1.5
14
tPLZ, tPHZ
-
6
1.5
8
CPD
-
-
-
-
(Note 7)
Minimum (Valley) VOHV During Switching of
Other Outputs (Output Under Test Not Switching)
VOHV
5
0.5
-
-
Maximum (Peak) VOLP During Switching of
Other Outputs (Output Under Test Not Switching)
VOLP
5
1
-
-
Input Capacitance
CI
-
-
-
10
Three-State Output Capacitance
CO
-
-
-
15
NOTES:
6. 5V: Minimum is at 5.25V for 0oC to 70oC, Maximum is at 4.75V for 0oC to 70oC, Typical is at 5V.
7.
CPD, measured per
PD (per package) =
flip-flop, is used to determine the
VCC ICC + Σ(VCC2 fI CPD + VO2
dynamic power consumption.
fOCL + VCC ∆ICC D) where:
VCC = supply voltage
∆ICC = flow through current x unit load
CL = output load capacitance
D = duty cycle of input high
fO = output frequency
fI = input frequency
UNITS
ns
ns
ns
ns
ns
ns
ns
pF
V
V
pF
pF
Prerequisite for Switching
PARAMETER
Setup Time, Data to LE
SYMBOL
tSU
Hold Time, Data to LE
LE Pulse Width
PRE, CLR Pulse Width
PRE, CLR Recovery Time
NOTE:
8. Minimum is at 4.75V for 0oC to 70oC, Typical is at 5V.
tH
tW
tW
tREC
VCC (V)
5
(Note 8)
5
5
5
5
25oC
TYP
-
-
-
-
-
0oC TO 70oC
MIN
MAX
2.5
-
2.5
-
4
-
8
-
14
-
UNITS
ns
ns
ns
ns
ns
Test Circuits and Waveforms
tr, tf = 2.5ns
(NOTE 9) VI
3V
0
PULSE ZO
GEN
RT = ZO
RT
VCC
V0
DUT
CL
50pF
NOTE:
9. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; Z
7V
500Ω
RL
500Ω
RL
≤ 50Ω;
SWITCH POSITION
TEST
SWITCH
tPLZ, tPZL, Open Drain
Closed
tPHZ, tPZH, tPLH, tPHL
Open
DEFINITIONS:
CL = Load capacitance, includes jig and probe
8-5
capacitance.
RT = Termination resistance, should be equal to ZOUT of
the Pulse Generator.
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