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PDF 74VCXH245 Data sheet ( Hoja de datos )
| Número de pieza | 74VCXH245 | |
| Descripción | Low Voltage Bidirectional Transceiver with Bushold | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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June 1999
Revised June 1999
74VCXH245
Low Voltage Bidirectional Transceiver with Bushold
General Description
The VCXH245 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 VCXH245
data inputs include active bushold circuitry, eliminating the
need for external pull-up resistors to hold unused or float-
ing data inputs at a valid logic level.
The 74VCXH245 is designed for low voltage (1.65V to
3.6V) VCC applications.
The 74VCXH245 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 Bushold on data inputs eliminates the need for external
pull-up/pull-down resistors
s tPD
3.5 ns max for 3.0V to 3.6V VCC
4.2 ns max for 2.3V to 2.7V VCC
8.4 ns max for 1.65V to 1.95V VCC
s Static Drive (IOH/IOL)
±24 mA @ 3.0V VCC
±18 mA @ 2.3V VCC
± 6mA @ 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
Ordering Code:
Order Number Package Number
Package Description
74VCXH245WM
M20B
20-Lead Small Outline Integrated Circuit, JEDEC MS-013, 0.300” Wide Body
74VCXH245MTC
MTC20
20-Lead Thin Shrink Small Outline Package, 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 Bushold Inputs or 3-STATE Outputs
Side B Bushold Inputs or 3-STATE Outputs
Quiet Series™ is a trademark of Fairchild Semiconductor Corporation.
© 1999 Fairchild Semiconductor Corporation ds500198
www.fairchildsemi.com
1 page  
AC Electrical Characteristics (Note 10)
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
tPLH
An to Bn or Bn to An
0.6 3.5 0.8 4.2 1.5 8.4
ns
tPZL
tPZH
Output Enable Time
0.6 4.5 0.8 5.6 1.5 9.8
ns
tPLZ
tPHZ
Output Disable Time
0.6 3.6 0.8 4.0 1.5 7.2
ns
tOSHL
tOSLH
Output to Output Skew
(Note 11)
0.5 0.5 0.75
ns
Note 10: For CL = 50 pF, add approximately 300 ps to the AC maximum specification.
Note 11: 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
VOLV
Quiet Output Dynamic Valley VOL
VOHV
Quiet Output Dynamic Valley VOH
Conditions
CL = 30 pF, VIH = VCC, VIL = 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 −0.3
2.5 −0.7
V
3.3 −1.0
1.8 1.3
2.5 1.7
V
3.3 2.0
Capacitance
Symbol
Parameter
CIN Input Capacitance
CI/O Input/Output Capacitance
CPD Power Dissipation Capacitance
Conditions
TA = +25°C
Typical
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
6
7
20
Units
pF
pF
pF
5 www.fairchildsemi.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet 74VCXH245.PDF ] | |
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