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PDF 74VCX245 Data sheet ( Hoja de datos )
| Número de pieza | 74VCX245 | |
| Descripción | Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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June 1999
Revised June 1999
74VCX2245
Low Voltage Bidirectional Transceiver
with 3.6V Tolerant Inputs and Outputs
and 26Ω Series Resistors in B Outputs
General Description
The VCX2245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is intended for bus ori-
ented applications. The T/R input determines the direction
of data flow. The OE input disables both the A and B ports
by placing them in a high impedance state.
The 74VCX2245 is designed for low voltage (1.65V to
3.6V) VCC applications with I/O compatibility up to 3.6V.
The VCX2245 is also designed with 26Ω series resistance
in the B Port outputs. This design reduces line noise in
applications such as memory address drivers, clock driv-
ers, and bus transceivers transmitters
The 74VCX2245 is fabricated with an advanced CMOS
technology to achieve high-speed operation while main-
taining low CMOS power dissipation.
Features
s 1.65V - 3.6V VCC supply operation
s 3.6V tolerant inputs and outputs
s 26Ω series resistors in B Port outputs
s Power-off high impedance inputs and outputs
s Supports Live Insertion and Withdrawal (Note 1)
s tPD (A to B)
4.4 ns max for 3.0V to 3.6V VCC
5.6 ns max for 2.3V to 2.7V VCC
9.8 ns max for 1.65V to 1.95V VCC
s Static Drive (IOH/IOL B outputs):
±12 mA @ 3.0V VCC
±8 mA @ 2.3V VCC
±3 mA @ 1.65V VCC
s Uses patented Quiet Series™ noise/EMI reduction
circuitry
s Latchup performance exceeds 300 mA
s ESD performance:
Human body model > 2000V
Machine model > 200V
Note 1: To ensure the high impedance state during power up and power
down, OEn should be tied to VCC through a pull up resistor. The minimum
value of the resistor is determined by the current sourcing capability of the
driver.
Ordering Code:
Order Number Package Number
Package Description
74VCX2245WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
74VCX2245MTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
Pin Descriptions
Pin Names
Description
OE Output Enable Input (Active LOW)
T/R Transmit/Receive Input
A0–A7
B0–B7
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs
Quiet Series™ is a trademark of Fairchild Semiconductor Corporation.
© 1999 Fairchild Semiconductor Corporation ds500170
www.fairchildsemi.com
1 page  
AC Electrical Characteristics (Note 9)
TA = −40°C to +85°C, CL = 30 pF, RL = 500Ω
Symbol
Parameter
VCC = 3.3V ± 0.3V
VCC = 2.5V ± 0.2V
VCC = 1.8V ± 0.15V
Units
Min Max Min Max Min Max
tPHL Propagation Delay, A to B
0.6 4.4 0.8 5.6 1.5 9.8 ns
tPLH
tPHL Propagation Delay, B to A
0.6 3.5 0.8 4.2 1.5 8.4 ns
tPLH
tPZL Output Enable Time, A to B
0.6 5.0 0.8 6.6 1.5 9.8 ns
tPZH
tPZL Output Enable Time, B to A
0.6 4.5 0.8 5.6 1.5 9.8 ns
tPZH
tPLZ Output Disable Time, A to B
0.6 4.2 0.8 4.7 1.5 8.5 ns
tPHZ
tPLZ Output Disable Time, B to A
0.6 3.6 0.8 4.0 1.5 7.2 ns
tPHZ
tOSHL
Output to Output Skew
0.5 0.5 0.75 ns
tOSLH
(Note 10)
Note 9: For CL = 50 pF, add approximately 300 ps to the AC maximum specification.
Note 10: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The
specification applies to any outputs switching in the same direction, either HIGH-to-LOW (tOSHL) or LOW-to-HIGH (tOSLH).
Dynamic Switching Characteristics
Symbol
Parameter
VOLP
Quiet Output Dynamic Peak VOL,
B to A
Quiet Output Dynamic Peak VOL,
A to B
VOLV
Quiet Output Dynamic Valley VOL,
B to A
Quiet Output Dynamic Valley, VOL,
A to B
VOHV
Quiet Output Dynamic Valley VOH,
B to A
Quiet Output Dynamic Valley VOH,
A to B
Conditions
CL = 30 pF, VIH = VCC, VIL = 0V
CL = 30 pF, VIH = VCC, VIL = 0V
CL = 30 pF, VIH = VCC, V IL = 0V
CL = 30 pF, VIH = VCC, V IL = 0V
CL = 30 pF, VIH = VCC, V IL = 0V
CL = 30 pF, VIH = VCC, V IL = 0V
VCC
TA = 25°C
Units
(V) Typical
1.8 0.3
2.5 0.7
V
3.3 1.0
1.8 0.2
2.5 0.45
V
3.3 0.65
1.8 −0.3
2.5 −0.7
V
3.3 −1.0
1.8 −0.2
2.5 −0.45
V
3.3 −0.65
1.8 1.3
2.5 1.7
V
3.3 2.0
1.8 1.5
2.5 2.0
V
3.3 2.5
Capacitance
Symbol
Parameter
CIN Input Capacitance
CI/O Input/Output Capacitance
CPD Power Dissipation Capacitance
Conditions
VI = 0V or VCC, VCC = 1.8V, 2.5V or 3.3V
VI = 0V or VCC, VCC = 1.8V, 2.5V or 3.3V
VI = 0V or VCC, f = 10 MHz, VCC = 1.8V, 2.5V or 3.3V
TA = +25°C
Typical
6
7
20
Units
pF
pF
pF
5 www.fairchildsemi.com
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet 74VCX245.PDF ] | |
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