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74LV245DB Arkusz danych(PDF) 2 Page - NXP Semiconductors

Numer części 74LV245DB
Szczegółowy opis  Octal bus transceiver 3-State
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Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74LV245DB Arkusz danych(HTML) 2 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74LV245
Octal bus transceiver (3-State)
2
1998 Apr 20
853–1931 19258
FEATURES
Wide operating voltage: 1.0 to 5.5 V
Optimized for low voltage applications: 1.0 to 3.6 V
Accepts TTL input levels between V
CC = 2.7 V and VCC = 3.6 V
Typical V
OLP (output ground bounce) < 0.8 V at VCC = 3.3 V,
Tamb = 25°C
Typical V
OHV (output VOH undershoot) > 2 V at VCC = 3.3 V,
Tamb = 25°C
Output capability: bus driver
I
CC category: MSI
DESCRIPTION
The 74LV245 is a low-voltage Si-gate CMOS device and is pin and
function compatible with 74HC/HCT245.
The 74LV245 is an octal transceiver featuring non-inverting 3-State
bus compatible outputs in both send and receive directions. The
74LV245 features an output enable (OE) input for easy cascading
and a send/receive (DIR) input for direction control. OE controls the
outputs so that the buses are effectively isolated.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25°C; tr = tf ≤ 2.5 ns
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
tPHL/tPLH
Propagation delay
An to Bn; Bn to An
CL = 15 pF;
VCC = 3.3 V
7.0
ns
CI
Input capacitance
3.5
pF
CI/O
Input/output capacitance
10
pF
CPD
Power dissipation capacitance per buffer
VCC = 3.3 V
VI = GND to VCC, note 1
40
pF
NOTE:
1. CPD is used to determine the dynamic power dissipation (PD in µW)
PD = CPD
VCC2
fi ) (CL
VCC2
fo) where:
fi = input frequency in MHz; CL = output load capacitance in pF;
fo = output frequency in MHz; VCC = supply voltage in V;
(CL
VCC2
fo) = sum of the outputs.
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE
OUTSIDE NORTH AMERICA
NORTH AMERICA
PKG. DWG. #
20-Pin Plastic DIL
–40
°C to +125°C
74LV245 N
74LV245 N
SOT146-1
20-Pin Plastic SO
–40
°C to +125°C
74LV245 D
74LV245 D
SOT163-1
20-Pin Plastic SSOP Type II
–40
°C to +125°C
74LV245 DB
74LV245 DB
SOT339-1
20-Pin Plastic TSSOP Type I
–40
°C to +125°C
74LV245 PW
74LV245PW DH
SOT360-1
PIN DESCRIPTION
PIN NUMBER
SYMBOL
FUNCTION
1
DIR
Direction
2, 3, 4, 5,
6, 7, 8, 9
A0 to A7
Data inputs/outputs
10
GND
Ground (0 V)
18, 17, 16, 15,
14, 13, 12, 11
B0 to B7
Data inputs/outputs
19
OE
Output enable input (active LOW)
20
VCC
Positive supply voltage
FUNCTION TABLE
INPUTS
INPUTS/OUTPUT
OE
DIR
An
Bn
L
L
A = B
Inputs
L
H
Inputs
B = A
H
X
Z
Z
NOTES:
H =
HIGH voltage level
L
=
LOW voltage level
X =
don’t care
Z =
high impedance OFF-state


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