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SN74LVCC4245ADBR Datasheet(PDF) 5 Page - Texas Instruments

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Part No. SN74LVCC4245ADBR
Description  OCTAL DUAL-SUPPLY BUS TRANSCEIVER WITH CONFIGURABLE OUTPUT VOLTAGE AND 3-STATE OUTPUTS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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SN74LVCC4245ADBR Datasheet(HTML) 5 Page - Texas Instruments

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Switching Characteristics
Operating Characteristics
Power-Up Considerations(1)
SN74LVCC4245A
OCTAL DUAL-SUPPLY BUS TRANSCEIVER
WITH CONFIGURABLE OUTPUT VOLTAGE AND 3-STATE OUTPUTS
SCAS584M – NOVEMBER 1996 – REVISED MARCH 2005
over recommended operating free-air temperature range, C
L = 50 pF (unless otherwise noted) (see Figure 1 through
Figure 4)
VCCA = 5 V ± 0.5 V,
VCCA = 5 V ± 0.5 V,
FROM
TO
VCCB = 5 V ± 0.5 V
VCCB = 2.7 V to 3.6 V
PARAMETER
UNIT
(INPUT)
(OUTPUT)
MIN
MAX
MIN
MAX
tPHL
1
7.1
1
7
A
B
ns
tPLH
1
6
1
7
tPHL
1
6.8
1
6.2
B
A
ns
tPLH
1
6.1
1
5.3
tPZL
1
9
1
9
OE
A
ns
tPZH
1
8.3
1
8
tPZL
1
8.2
1
10
OE
B
ns
tPZH
1
8.1
1
10.2
tPLZ
1
4.7
1
5.2
OE
A
ns
tPHZ
1
4.9
1
5.2
tPLZ
1
5.4
1
5.4
OE
B
ns
tPHZ
1
6.3
1
7.4
V
CCA = 5 V, VCCB = 3.3 V, TA = 25°C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Outputs enabled
20
Cpd
Power dissipation capacitance per transceiver
CL = 0,
f = 10 MHz
pF
Outputs disabled
6.5
TI 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. Power up the control side of the device (VCCA for all four of these devices).
3. Tie OE to VCCA 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. Otherwise, keep DIR low.
(1)
Refer to the TI application report, Texas Instruments Voltage-Level-Translation Devices, literature number SCEA021.
5


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