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74VHC245SJ 반도체 회로 부품 판매점

Octal Bidirectional Transceiver with 3-STATE Outputs



Fairchild Semiconductor 로고
Fairchild Semiconductor
74VHC245SJ 데이터시트, 핀배열, 회로
November 1992
Revised March 1999
74VHC245
Octal Bidirectional Transceiver with 3-STATE Outputs
General Description
The VHC245 is an advanced high speed CMOS octal bus
transceiver fabricated with silicon gate CMOS technology.
It achieves high speed operation similar to equivalent Bipo-
lar Schottky TTL while maintaining the CMOS low power
dissipation. The VHC245 is intended for bidirectional asyn-
chronous communication between data busses. The direc-
tion of data transmission is determined by the level of the
T/R input. The enable input can be used to disable the
device so that the busses are effectively isolated. All inputs
are equipped with protection circuits against static dis-
charge.
Features
s High Speed: tPD = 4.0 ns (typ) at VCC = 5V
s High Noise Immunity: VNIH = VNIL = 28% VCC (Min)
s Power Down Protection is provided on all inputs
s Low Noise: VOLP = 0.9V (typ)
s Low Power Dissipation:
ICC = 4 µA (Max) @ TA = 25°C
s Pin and Function Compatible with 74HC245
Ordering Code:
Order Number Package Number
Package Description
74VHC245M
M20B
20-Lead Small Outline Integrated Package (SOIC), JEDEC MS-013, 0.300” Wide
74VHC245SJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74VHC245MTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74VHC245N
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
Connection Diagram
IEEE/IEC
Pin Description
Pin
Names
OE
T/R
A0–A7
B0–B7
Description
Output Enable Input
Transmit/Receive Input
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs
© 1999 Fairchild Semiconductor Corporation DS011520.prf
Truth Table
Inputs
Outputs
OE T/R
L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X HIGH-Z State
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial
Any unused bus terminals during HIGH-Z State must be held HIGH or
LOW.
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74VHC245SJ 데이터시트, 핀배열, 회로
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC)
DC Input Voltage (VIN) (T/R, OE)
DC Output Voltage (VOUT)
Input Diode Current (IIK) (T/R, OE)
Output Diode Current (IOK)
DC Output Current (IOUT)
DC VCC/GND Current (ICC)
Storage Temperature (TSTG)
Lead Temperature (TL)
(Soldering, 10 seconds)
0.5V to +7.0V
0.5V to 7.0V
0.5V to VCC + 0.5V
20 mA
±20 mA
±25 mA
±75 mA
65°C to +150°C
260°C
Recommended Operating
Conditions (Note 2)
Supply Voltage (VCC)
2.0V to 5.5V
Input Voltage (VIN)(T/R, OE)
0V to 5.5V
Output Voltage (VOUT)
0V to VCC
Operating Temperature (TOPR)
40°C to +85°C
Input Rise and Fall Time (tr, tf)
VCC = 3.3V ± 0.3V
VCC = 5.0V ± 0.5V
0 100 ns/V
0 20 ns/V
Note 1: Absolute Maximum Ratings are values beyond which the device
may be damaged or have its useful life impaired. The databook specifica-
tions should be met, without exception, to ensure that the system design is
reliable over its power supply, temperature, and output/input loading vari-
ables. Fairchild does not recommend operation outside databook specifica-
tions.
Note 2: Unused inputs or I/O pins must be held HIGH or LOW. They may
not float.
DC Electrical Characteristics
Symbol
VIH
VIL
VOH
VOL
IOZ
IIN
(T/R, OE)
ICC
Parameter
HIGH Level
Input Voltage
LOW Level
Input Voltage
HIGH Level
Output Voltage
LOW Level
Output Voltage
3-STATE Output
Off-State Current
VCC
(V)
2.0
3.0 5.5
2.0
3.0 5.5
2.0
3.0
4.5
3.0
4.5
2.0
3.0
4.5
3.0
4.5
Min
1.50
0.7 VCC
1.9
2.9
4.4
2.58
3.94
TA = 25°C
Typ
2.0
3.0
4.5
0.0
0.0
0.0
Max
0.50
0.3 VCC
0.1
0.1
0.1
0.36
0.36
5.5 ±0.25
Input Leakage
Current
0 5.5
Quiescent Supply Current 5.5
±0.1
4.0
TA = −40°C to +85°C
Min Max
1.50
0.7 VCC
0.50
0.3 VCC
1.9
2.9
4.4
2.48
3.80
0.1
0.1
0.1
0.44
0.44
±2.5
±1.0
40.0
Units
Conditions
V
V
VIN = VIH IOH = −50 µA
V or VIL
V IOH = −4 mA
IOH = −8 mA
VIN = VIH IOL = 50 µA
V or VIL
V IOL = 4 mA
IOL = 8 mA
VIN = VCC or GND
µA VOUT = VCC or GND
VIN OE = VIH or VIL
µA VIN = 5.5V or GND
µA VIN = VCC or GND
www.fairchildsemi.com
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74VHC245SJ transceiver

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74VHC245SJ

Octal Bidirectional Transceiver with 3-STATE Outputs - Fairchild Semiconductor