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74VHC245T 데이터시트 PDF




STMicroelectronics에서 제조한 전자 부품 74VHC245T은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 74VHC245T 자료 제공

부품번호 74VHC245T 기능
기능 OCTAL BUS TRANSCEIVER 3-STATE
제조업체 STMicroelectronics
로고 STMicroelectronics 로고


74VHC245T 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




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74VHC245T 데이터시트, 핀배열, 회로
®
s HIGH SPEED: tPD = 4.0 ns (TYP.) at VCC = 5V
s LOW POWER DISSIPATION:
ICC = 4 µA (MAX.) at TA = 25 oC
s HIGH NOISE IMMUNITY:
VNIH = VNIL = 28% VCC (MIN.)
s POWER DOWN PROTECTION ON CONTROL
INPUTS
s SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 8 mA (MIN)
s BALANCED PROPAGATION DELAYS:
tPLH tPHL
s OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V to 5.5V
s PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 245
s IMPROVED LATCH-UP IMMUNITY
s LOW NOISE VOLP = 0.9V (Max.)
DESCRIPTION
The 74VHC245 is an advanced high-speed
CMOS OCTAL BUS TRANSCEIVER (3-STATE)
fabricated with sub-micron silicon gate and
double-layer metal wiring C2MOS technology.
This IC is intended for two-way asynchronous
communication between data busses; the
direction of data trasmission is determined by the
level of the DIR input. The enable input G can be
PIN CONNECTION AND IEC LOGIC SYMBOLS
74VHC245
OCTAL BUS
TRANSCEIVER (3-STATE)
PRELIMINARY DATA
M
(Micro Package)
T
(TSSOP Package)
ORDER CODES :
74VHC245M
74VHC245T
used to disable the device so that the busses are
effectively isolated.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2kV ESD immunity and transient excess
voltage.
IT IS PROHIBITED TO APPLY A SIGNAL TO A
TERMINAL WHEN IT IS IN OUTPUT MODE
AND WHEN A BUS TERMINAL IS FLOATING
(HIGH IMPEDANCE STATE) IT IS REQUESTED
TO FIX THE INPUT LEVEL BY MEANS OF
EXTERNAL PULL DOWN OR PULL UP
RESISTOR.
June 1999
1/8




74VHC245T pdf, 반도체, 판매, 대치품
74VHC245
CAPACITIVE CHARACTERISTICS
Symb ol
Parameter
Test Conditions
Valu e
Unit
TA = 25 oC
-40 to 85 oC
Min. T yp. Max. Min. Max.
CIN Input Capacitance
4 10
10 pF
CI/O Bus Input Capacitance
8 pF
CPD Power Dissipation
Capacitance (note 1)
21 pF
1) CPD isdefined as the value of the IC’sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto
Test Circuit).Average operting current can be obtained by the following equation. ICC(opr) = CPD VCC fIN + ICC/8(per circuit)
DYNAMIC SWITCHING CHARACTERISTICS
Symb ol
Parameter
Test Conditions
V CC
( V)
Value
TA = 25 oC
Min. Typ. Max.
-40 to 85 oC
Min . Max.
Un it
VOLP Dynamic Low Voltage
VOLV Quiet Output (note 1, 2)
5.0
0.6 0.9
-0.9 -0.6
VIHD Dynamic High Voltage
Input (note 1, 3)
5.0
CL = 50 pF
3.5
V
VILD Dynamic Low Voltage
Input (note 1, 3)
5.0
1.5
1) Worst case package.
2) Max number of outputs defined as (n). Data inputs are driven 0V to 5.0V, (n -1) outputs switching and one output at GND.
3) Max number of data inputs (n) switching. (n-1) switching 0V to5.0V. Inputs under test switching: 5.0V to threshold (VILD), 0V to threshold (VIHD), f=1MHz.
TEST CIRCUIT
TEST
tPLH, tPHL
tPZL, tPLZ
tPZH, tPHZ
CL = 15/50 pF or equivalent (includes jig and probe capacitance)
RL = R1 = 1Korequivalent
RT = ZOUT of pulse generator (typically 50)
4/8
SW IT CH
Open
VCC
GND

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74VHC245T 전자부품, 판매, 대치품
DIM.
A
A1
A2
b
c
D
E
E1
e
K
L
74VHC245
TSSOP20 MECHANICAL DATA
MIN.
0.05
0.85
0.19
0.09
6.4
6.25
4.3
0o
0.50
mm
TYP.
0.10
0.9
6.5
6.4
4.4
0.65 BSC
4o
0.60
MAX.
1.1
0.15
0.95
0.30
0.2
6.6
6.5
4.48
8o
0.70
MIN.
0.002
0.335
0.0075
0.0035
0.252
0.246
0.169
0o
0.020
inch
TYP.
0.004
0.354
0.256
0.252
0.173
0.0256 BSC
4o
0.024
MAX.
0.433
0.006
0.374
0.0118
0.0079
0.260
0.256
0.176
8o
0.028
A A2
A1 b
e
D
PIN 1 IDENTIFICATION
1
K
c
L
E
E1
7/8

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