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HD74LS245
Octal Bus Transceivers (with three-state outputs)
REJ03D0464-0300 Rev.3.00 Jul.15.2005 This octal bus transceiver is designed for synchronous two-way communication between data buses. The control function implementation minimizes external timing requirements. The device allows data transmission from the A bus to the B bus or from the B bus to the A bus depending upon the logic level at the direction control (DIR) input. The enable input (G) can be used to disable the device so that the buses are effectively isolated.
Features
* Ordering Information
Part Name HD74LS245P HD74LS245FPEL HD74LS245RPEL Package Type DILP-20 pin SOP-20 pin (JEITA) SOP-20 pin (JEDEC) Package Code (Previous Code) PRDP0020AC-B (DP-20NEV) PRSP0020DD-B (FP-20DAV) PRSP0020DC-A (FP-20DBV) Package Abbreviation P FP RP Taping Abbreviation (Quantity) -- EL (2,000 pcs/reel) EL (1,000 pcs/reel)
Note: Please consult the sales office for the above package availability.
Pin Arrangement
DIR A1 A2 A3 A4 A5 A6 A7 A8 GND
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
VCC Enable G B1 B2 B3 B4 B5 B6 B7 B8
(Top view)
Rev.3.00, Jul.15.2005, page 1 of 5
HD74LS245
Function Table
Enable G L L H Note: H; high level, L; low level, X; irrelevant Direction Control DIR L H X Operation B data to A bus A data to B bus Isolation
Block Diagram
Enable G Transceiver (1/8)
B
A
Direction Control DIR
Absolute Maximum Ratings
Item Supply voltage Input voltage Power dissipation Storage temperature Operating temperature DIR, G A, B Symbol VCC VIN VIN PT Tstg Topr Ratings 7 7 5.5 400 -65 to +150 -20 to +75 Unit V V V mW C C
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Recommended Operating Conditions
Item Supply voltage Output current Operating temperature Symbol VCC IOH IOL Topr Min 4.75 -- -- -20 Typ 5.00 -- -- 25 Max 5.25 -15 24 75 Unit V mA mA C
Rev.3.00, Jul.15.2005, page 2 of 5
HD74LS245
Electrical Characteristics
(Ta = -20 to +75 C)
Item Input voltage Hysteresis Symbol VIH VIL VT+ - VT- VOH Output voltage VOL Off-state output current IOZH IOZL IIH IIL II IOS ICCH ICCL min. 2.0 -- 0.2 2.4 2 -- -- -- -- -- -- -- -- -40 -- -- typ.* -- -- 0.4 -- -- -- -- -- -- -- -- -- -- -- 48 62 max. -- 0.8 -- -- -- 0.4 0.5 20 -200 20 -0.2 0.1 0.1 -225 70 90 Unit V V V V A A mA mA mA VCC = 4.75 V IOH = - 3 mA VCC = 4.75 V, VIH = 2 V, IOH = - 15 mA VIL = 0.8 V IOL = 12 mA VCC = 4.75 V, VIH = 2 V, VIL = 0.8 V IOL = 24 mA VO = 2.7 V VCC = 5.25 V, G = 2 V VO = 0.4 V VCC = 5.25 V, VI = 2.7 V VCC = 5.25 V, VI = 0.4 V VCC = 5.25 V, VI = 5.5 V VCC = 5.25 V, VI = 7 V VCC = 5.25 V Condition
Input current
A or B DIR or G
Short-circuit output current Supply current**
mA
VCC = 5.25 V
-- 64 95 ICCZ Input clamp voltage VIK -- -- -1.5 V VCC = 4.75 V, IIN = -18 mA Notes: * VCC = 5 V, Ta = 25C ** With all outputs open, ICC is measured with transceivers enabled in one direction only, or with all transceivers disabled.
Switching Characteristics
(VCC = 5 V, Ta = 25C)
Item Propagation delay time Output enable time Output disable time Symbol tPLH tPHL tZL tZH tLZ tHZ min. -- -- -- -- -- -- typ. 8 11 27 25 15 15 max. 15 15 40 40 25 25 Unit Condition
CL = 45 pF, RL = 667 ns CL = 5 pF, RL = 667
Note: Refer to Test Circuit and Waveform of the Common Item "TTL Common Matter (Document No.: REJ27D00050100)".
Rev.3.00, Jul.15.2005, page 3 of 5
HD74LS245
Package Dimensions
JEITA Package Code P-DIP20-6.3x24.5-2.54 RENESAS Code PRDP0020AC-B Previous Code DP-20NEV MASS[Typ.] 1.26g
D
20
11
1 0.89 b3
10
Z
E
Reference Symbol
Dimension in Millimeters Min Nom 7.62 24.50 6.30 25.40 7.00 5.08 0.51 0.40 0.48 1.30 0.19 0 2.29 2.54 0.25 0.31 15 2.79 1.27 2.54 0.56 Max
A
A1
e D E
L
1
A A1 b
p 3
e
bp
e1
c
b c
e Z
( Ni/Pd/Au plating )
L
JEITA Package Code P-SOP20-5.5x12.6-1.27
RENESAS Code PRSP0020DD-B
Previous Code FP-20DAV
MASS[Typ.] 0.31g
*1
D 11
F
NOTE) 1. DIMENSIONS"*1 (Nom)"AND"*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION"*3"DOES NOT INCLUDE TRIM OFFSET.
20
bp
E
HE
Index mark
Reference Symbol
*2
c
Dimension in Millimeters Min Nom 12.60 5.50 Max 13.0
Terminal cross section ( Ni/Pd/Au plating )
1 Z e
*3
D E A2 A1 0.00
10 bp x M L1
0.10
0.20 2.20
A bp b1 c c
1
0.34
0.40
0.46
0.15
0.20
0.25
A
HE
0 7.50 7.80 1.27
8 8.00
y
e x y
A1
L
0.12 0.15 0.80 0.50
1
Detail F
Z L L 0.70 1.15
0.90
Rev.3.00, Jul.15.2005, page 4 of 5
HD74LS245
JEITA Package Code P-SOP20-7.5x12.8-1.27 RENESAS Code PRSP0020DC-A Previous Code FP-20DBV MASS[Typ.] 0.52g
*1
D
F 11 NOTE) 1. DIMENSIONS"*1 (Nom)"AND"*2" @ DO NOT INCLUDE MOLD FLASH. 2. DIMENSION"*3"DOES NOT @ INCLUDE TRIM OFFSET.
20
bp
*2
HE
E
Index mark
Reference Symbol
c
Dimension in Millimeters Min Nom 12.80 7.50 Max 13.2
Terminal cross section ( Ni/Pd/Au plating )
1 Z e
*3
D E A2
10 bp x M L1
A1 A bp b1 c c
1
0.10
0.20
0.30 2.65
0.34
0.40
0.46
0.20
0.25
0.30
A
HE
0 10.00 10.40 1.27
8 10.65
A1
y L
e x y Z
0.12 0.15 0.935 0.40
1
Detail F
L L
0.70 1.45
1.27
Rev.3.00, Jul.15.2005, page 5 of 5
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