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74VHC245 PDF даташит

Спецификация 74VHC245 изготовлена ​​​​«Fairchild Semiconductor» и имеет функцию, называемую «Octal Bidirectional Transceiver with 3-STATE Outputs».

Детали детали

Номер произв 74VHC245
Описание Octal Bidirectional Transceiver with 3-STATE Outputs
Производители Fairchild Semiconductor
логотип Fairchild Semiconductor логотип 

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74VHC245 Даташит, Описание, Даташиты
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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74VHC245 Даташит, Описание, Даташиты
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
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74VHC245 Даташит, Описание, Даташиты
Noise Characteristics
Symbol
Parameter
VOLP
(Note 3)
VOLV
(Note 3)
VIHD
(Note 3)
Quiet Output Maximum
Dynamic VOL
Quiet Output Minimum
Dynamic VOL
Minimum HIGH Level
Dynamic Input Voltage
VILD
(Note 3)
Maximum LOW Level
Dynamic Input Voltage
Note 3: Parameter guaranteed by design.
VCC
TA = 25°C
Units
(V) Typ Limits
Conditions
5.0 0.9 1.2
V CL = 50 pF
5.0
0.9
1.2
V CL = 50 pF
5.0 3.5 V CL = 50 pF
5.0 1.5 V CL = 50 pF
AC Electrical Characteristics
Symbol
Parameter
VCC
(V)
TA = 25°C
TA = −40°C to +85°C
Units
Min Typ Max Min Max
Conditions
tPLH Propagation Delay
tPHL
Time
tPZL 3-STATE Output
tPZH
Enable Time
tPLZ
tPHZ
tOSLH
tOSHL
CIN
3-STATE Output
Disable Time
Output to Output
Skew
Input Capacitance
3.3 ± 0.3
5.0 ± 0.5
3.3 ± 0.3
5.0 ± 0.5
3.3 ± 0.3
5.0 ± 0.5
3.3 ± 0.3
5.0 ± 0.5
5.8 8.4 1.0 10.0
ns
8.3 11.9 1.0 13.5
CL = 15 pF
CL = 50 pF
4.0 5.5 1.0 6.5
ns
5.5 7.5 1.0 8.5
CL = 15 pF
CL = 50 pF
8.5
13.2
1.0
15.5
ns RL = 1 kCL = 15 pF
11.0 16.7 1.0 19.0
CL = 50 pF
5.8 8.5 1.0 10.0
ns
7.3 10.6 1.0 12.0
CL = 15 pF
CL = 50 pF
11.5 15.8
1.0
18.0
ns RL = 1 kCL = 50 pF
7.0 9.7 1.0 11.0
CL = 50 pF
1.5 1.5 ns (Note 4) CL = 50 pF
1.0 1.0
CL = 50 pF
4 10
10 pF VCC = Open
(T/R, OE)
CI/O Output Capacitance
CPD Power Dissipation
Capacitance
8
21
pF VCC = 5.0V
pF (Note 5)
Note 4: Parameter guaranteed by design. tOSLH = |tPLH max tPLH min|; tOSHL = |tPHL max tPHL min|
Note 5: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average
operating current can be obtained by the equation: ICC (opr.) = CPD * VCC * fIN + ICC/8 (per Bit).
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