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HD74LVCC4245A Datasheet(PDF) 6 Page - Renesas Technology Corp

Part No. HD74LVCC4245A
Description  Octal Dual-supply Bus Transceiver with configurable output voltage with 3-state Outputs
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD74LVCC4245A Datasheet(HTML) 6 Page - Renesas Technology Corp

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HD74LVCC4245A
Rev.1.00 Aug. 23, 2004 page 6 of 10
Switching Characteristics
Ta = –40 to 85°C, VCCA = 5.0±0.5 V, VCCB = 2.7 to 3.6 V
Item
Symbol
Min
Typ
Max
Unit
Test conditions
From(Input) To(Output)
tPLH
1
7
tPHL
1
7
AB
tPLH
1
5.3
Propagation delay
time
tPHL
1
6.2
ns
CL = 50 pF
RL = 500
BA
tZH
1
8
tZL
1
9
OE
A
tZH
1
10.2
Output enable time
tZL
1
10
ns
CL = 50 pF
RL = 500
OE
B
tHZ
1
5.2
tLZ
1
5.2
OE
A
tHZ
1
7.4
Output disable time
tLZ
1
5.4
ns
CL = 50 pF
RL = 500
OE
B
Ta = –40 to 85°C, VCCA = 5.0±0.5 V, VCCB = 5.0±0.5 V
Item
Symbol
Min
Typ
Max
Unit
Test conditions
From(Input) To(Output)
tPLH
1
6
tPHL
1
7.1
AB
tPLH
1
6.1
Propagation delay
time
tPHL
1
6.8
ns
CL = 50 pF
RL = 500
BA
tZH
1
8.3
tZL
1
9
OE
A
tZH
1
8.1
Output enable time
tZL
1
8.2
ns
CL = 50 pF
RL = 500
OE
B
tHZ
1
4.9
tLZ
1
4.7
OE
A
tHZ
1
6.3
Output disable time
tLZ
1
5.4
ns
CL = 50 pF
RL = 500
OE
B
Operating Characteristics
Item
Symbol
VCCA (V)
VCCB (V)
Min
Typ
Max
Unit
Test Conditions
Power dissipation
capacitance
CPD
5.0
3.0
20
pF
f = 10 MHz, CL = 0
Power-up considerations
Level-translation devices offer an opportunity for successful mixed-voltage signal design.
A proper power-up sequence always should be followed to avoid excessive supply current, bus contention, oscillations,
or other anomalies caused by improperly biased device pins.
Take these precautions to guard against such power-up problems.
1. Connect ground before any supply voltage is applied.
2. Next, power up the control side of the device.
(Power up of VCCA is first. Next power up is VCCB. )
3. Tie
OE to V
CCA with a pullup resistor so that it ramps with VCCA.
4. Depending on the direction of the data path, DIR can be high or low.
If DIR high is needed (A data to B bus), ramp it with VCCA. Overwise, keep DIR low.


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