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CD74FCT844AEN データシート(PDF) 5 Page - Texas Instruments

部品番号 CD74FCT844AEN
部品情報  BiCMOS FCT Interface Logic, 9-Bit Transparent Latches, Three-State
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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CD74FCT844AEN データシート(HTML) 5 Page - Texas Instruments

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8-5
Switching Specifications Over Operating Range FCT Series tr, tf = 2.5ns, CL = 50pF, RL (Figure 1)
PARAMETER
SYMBOL
VCC (V)
25oC0oC TO 70oC
UNITS
TYP
MIN
MAX
Propagation Delays
Data to Outputs
CD74FCT843A
tPLH, tPHL
5
(Note 6)
6.8
1.5
9
ns
CD74FCT844A
tPLH, tPHL
5
7.5
1.5
10
ns
LE to Outputs
tPLH, tPHL
5
9
1.5
12
ns
PRE to Outputs
tPLH
5
9
1.5
12
ns
CLR to Outputs
tPHL
5
9.8
1.5
13
ns
Output Enable Times
tPZL, tPZH
-
10.5
1.5
14
ns
Output Disable Times
tPLZ, tPHZ
-
6
1.5
8
ns
Power Dissipation Capacitance
CPD
(Note 7)
----
pF
Minimum (Valley) VOHV During Switching of
Other Outputs (Output Under Test Not Switching)
VOHV
5
0.5
-
-
V
Maximum (Peak) VOLP During Switching of
Other Outputs (Output Under Test Not Switching)
VOLP
51
-
-
V
Input Capacitance
CI
---
10
pF
Three-State Output Capacitance
CO
---
15
pF
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 flip-flop, is used to determine the dynamic power consumption.
PD (per package) = VCC ICC + Σ(VCC
2 f
I CPD + VO
2 f
OCL + 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
Prerequisite for Switching
PARAMETER
SYMBOL
VCC (V)
25oC0oC TO 70oC
UNITS
TYP
MIN
MAX
Setup Time, Data to LE
tSU
5
(Note 8)
-
2.5
-
ns
Hold Time, Data to LE
tH
5
-
2.5
-
ns
LE Pulse Width
tW
5-4-
ns
PRE, CLR Pulse Width
tW
5-8-
ns
PRE, CLR Recovery Time
tREC
5
-
14
-
ns
NOTE:
8. Minimum is at 4.75V for 0oC to 70oC, Typical is at 5V.
Test Circuits and Waveforms
NOTE:
9. Pulse Generator for All Pulses: Rate
≤ 1.0MHz; ZOUT ≤ 50Ω;
3V
0
DUT
PULSE ZO
GEN
7V
500
50pF
500
VCC
RT
RT = ZO
V0
CL
RL
RL
VI
tr, tf = 2.5ns
(NOTE 9)
SWITCH POSITION
TEST
SWITCH
tPLZ, tPZL, Open Drain
Closed
tPHZ, tPZH, tPLH, tPHL
Open
DEFINITIONS:
CL = Load capacitance, includes jig and probe
capacitance.
RT = Termination resistance, should be equal to ZOUT of
the Pulse Generator.
V
0V to 3V
CD74FCT843A, CD74FCT844A


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