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PDF MC74VHC245 Data sheet ( Hoja de datos )
| Número de pieza | MC74VHC245 | |
| Descripción | Octal Bus Transceiver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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ON Semiconductort
Octal Bus Transceiver
The MC74VHC245 is an advanced high speed CMOS octal bus
transceiver fabricated with silicon gate CMOS technology. It achieves
high speed operation similar to equivalent Bipolar Schottky TTL
while maintaining CMOS low power dissipation.
It is intended for two−way asynchronous communication between
data buses. The direction of data transmission is determined by the
level of the DIR input. The output enable pin (OE) can be used to
disable the device, so that the buses are effectively isolated.
All inputs are equipped with protection circuits against static
discharge.
• High Speed: tPD = 4.0ns (Typ) at VCC = 5V
• Low Power Dissipation: ICC = 4μA (Max) at TA = 25°C
• High Noise Immunity: VNIH = VNIL = 28% VCC
• Power Down Protection Provided on Inputs
• Balanced Propagation Delays
• Designed for 2V to 5.5V Operating Range
• Low Noise: VOLP = 1.2V (Max)
• Pin and Function Compatible with Other Standard Logic Families
• Latchup Performance Exceeds 300mA
• ESD Performance: HBM > 2000V; Machine Model > 200V
• Chip Complexity: 308 FETs or 77 Equivalent Gates
w These devices are available in Pb−free package(s). Specwiwfwic.DaattaiSohneest4Uh.ceormein
apply to both standard and Pb−free devices. Please see our website at
www.onsemi.com for specific Pb−free orderable part numbers, or
contact your local ON Semiconductor sales office or representative.
APPLICATION NOTES
• Do not force a signal on an I/O pin when it is an active output,
damage may occur.
• All floating (high impedance) input or I/O pins must be fixed by
means of pull up or pull down resistors or bus terminator ICs.
• A parasitic diode is formed between the bus and VCC terminals.
Therefore, the VHC245 cannot be used to interface 5V to 3V systems
directly.
MC74VHC245
DW SUFFIX
20−LEAD SOIC WIDE PACKAGE
CASE 751D−05
DT SUFFIX
20−LEAD TSSOP PACKAGE
CASE 948E−02
M SUFFIX
20−LEAD SOIC EIAJ PACKAGE
CASE 967−01
ORDERING INFORMATION
MC74VHCXXXDW SOIC WIDE
MC74VHCXXXDT
TSSOP
MC74VHCXXXM
SOIC EIAJ
© Semiconductor Components Industries, LLC, 2006
March, 2006 − Rev. 5
1
Publication Order Number:
MC74VHC245/D
1 page  
SWITCHING WAVEFORMS
A or B
tPLH
B or A
50%
50% VCC
Figure 3.
VCC
GND
tPHL
DIR
OE
A or B
A or B
50%
50% VCC
tPZL
tPLZ
50% VCC
tPZH
50% VCC
tPHZ
50% VCC
Figure 4.
VCC
GND
VCC
GND
HIGH
IMPEDANCE
VOL +0.3V
VOH −0.3V
HIGH
IMPEDANCE
TEST CIRCUITS
DEVICE
UNDER
TEST
TEST POINT
OUTPUT
CL*
DEVICE
UNDER
TEST
TEST POINT
OUTPUT
1 kΩ
CL*
CONNECT TO VCC WHEN
TESTING tPLZ AND tPZL.
CONNECT TO GND WHEN
TESTING tPHZ AND tPZH.
*Includes all probe and jig capacitance
Figure 5.
*Includes all probe and jig capacitance
Figure 6.
http://onsemi.com
5
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| PDF Descargar | [ Datasheet MC74VHC245.PDF ] | |
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