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HD74HCT238
3-to-8-line Decoder/Demultiplexer
REJ03D0661-0200 (Previous ADE-205-549) Rev.2.00 Mar 30, 2006
Description
The HD74HCT238 has 3 binary select inputs (A, B, and C). If the device is enabled these inputs determined which one of the eight normally high outputs will go low. Two active low and one active high enables (G1, G2A and G2B) are provided to ease the cascading of decoders.
Features
* * * * * * High Speed Operation: tpd (A, B, C to Y) = 16.5 ns typ (CL = 50 pF) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 V to 6 V Low Input Current: 1 A max Low Quiescent Supply Current: ICC (static) = 4 A max (Ta = 25C) Ordering Information
Part Name HD74HCT238FPEL HD74HCT238RPEL Package Type SOP-16 pin (JEITA) SOP-16 pin (JEDEC) Package Code (Previous Code) PRSP0016 DH-B (FP-16DAV) FP Package Abbreviation Taping Abbreviation (Quantity) EL (2,000 pcs/reel) EL (2,500 pcs/reel)
PRSP0016 DG-A RP (FP-16DNV) Note: Please consult the sales office for the above package availability.
Function Table
Inputs Enable G2A G2B C X H X H X X X X X L L L L L L L L L L L L L L H L L H L L H L L H High level Low level Irrelevant Select B X X X L L H H L L H H Outputs A X X X L H L H L H L H Y0 L L L H L L L L L L L Y1 L L L L H L L L L L L Y2 L L L L L H L L L L L Y3 L L L L L L H L L L L Y4 L L L L L L L H L L L Y5 L L L L L L L L H L L Y6 L L L L L L L L L H L Y7 L L L L L L L L L L H
G1 X X L H H H H H H H H H: L: X:
Rev.2.00 Mar 30, 2006 page 1 of 5
HD74HCT238
Pin Arrangement
A Select Inputs B C G2A Enable Inputs G2B G1 Outputs Y7 GND 1 2 3 4 5 6 7 8 (Top view) B C G2A G2B G1 Y7 A Y0 Y1 Y2 Y3 Y4 Y5 16 VCC 15 Y0 14 Y1 13 Y2 12 Y3 11 Y4 10 Y5 9 Y6 Outputs
Y6
Logic Diagram
G1 G2B G2A Y1 A Y2 Y3 B C Y4 Y5 Y6 Y7 Y0
Absolute Maximum Ratings
Item Supply voltage range Input voltage Output voltage Output current DC current drain per VCC, GND DC input diode current DC output diode current Power dissipation per package Storage temperature Symbol VCC VIN VOUT IOUT ICC, IGND IIK IOK PT Tstg Rating -0.5 to +7.0 -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 25 50 20 20 500 -65 to +150 Unit V V V mA mA mA mA mW
C
Note: The absolute maximum ratings are values, which must not individually be exceeded, and furthermore, no two of which may be realized at the same time.
Rev.2.00 Mar 30, 2006 page 2 of 5
HD74HCT238
Recommended Operating Conditions
Item Supply voltage Input / Output voltage Operating temperature Input rise / fall time*1 Symbol VCC VIN, VOUT Ta tr, tf Ratings 4.5 to 5.5 0 to VCC -40 to 85 0 to 500 Unit V V Conditions
C
ns VCC = 4.5 V
Notes: 1. This item guarantees maximum limit when one input switches. Waveform: Refer to test circuit of switching characteristics.
Electrical Characteristics
Item Input voltage Output voltage Symbol VIH VIL VOH VOL Input current Quiescent supply current Iin ICC VCC (V) 4.5 to 5.5 4.5 to 5.5 4.5 4.5 4.5 4.5 5.5 5.5 Min 2.0 -- 4.4 4.18 -- -- -- -- Ta = 25C Typ Max -- -- -- 0.8 -- -- -- -- -- 0.1 -- 0.26 -- -- 0.1 4.0 Ta = -40 to+85C Min Max 2.0 -- -- 0.8 4.4 -- 4.13 -- -- 0.1 -- 0.33 -- -- 1.0 40 Unit V V V V A A Test Conditions
Vin = VIH or VIL IOH = -20 A IOH = -4 mA Vin = VIH or VIL IOL = 20 A IOL = 4 mA Vin = VCC or GND Vin = VCC or GND, Iout = 0 A
Switching Characteristics
(CL = 50 pF, Input tr = tf = 6 ns)
Item Propagation delay time Symbol VCC (V) tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tTLH tTHL Cin 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 -- Ta = 25C Ta = -40 to +85C Min Typ Max Min Max -- 18 30 -- 38 -- 19 30 -- 38 -- 17 30 -- 38 -- 17 30 -- 39 -- 17 30 -- 38 -- 17 30 -- 38 -- 17 30 -- 38 -- 17 30 -- 38 -- -- 5 5 15 10 -- -- 19 10 Unit ns ns ns ns ns pF Test Conditions A, B or C to Y G2A to Y G2B to Y G1 to Y
Output rise/fall time Input capacitance
Rev.2.00 Mar 30, 2006 page 3 of 5
HD74HCT238
Test Circuit
VCC VCC
Input Pulse Generator Zout = 50 Input Pulse Generator Zout = 50
See Function Table
A B C Y0
Output
CL = 50 pF Output Y7 CL = 50 pF
G1 G2A G2B
Note : 1. CL includes probe and jig capacitance.
Waveforms
tr 90 % 1.3 V 10 % tPLH 90 % Same-phase output 1.3 V 10 % tTLH 90 % 1.3 V 10 % tPHL 90 % 1.3 V 10 % tTHL VOH VOL VOH VOL tf VCC 0V
Input
tPHL 90 % Inverse-phase output
tPLH
90 % 1.3 V 10 % tTHL 1.3 V 10 % tTLH
Notes: 1. Input waveform: PRR 1 MHz, Zo = 50 , tr 6 ns, tf 6 ns 2. The output are measured one at a time with one transition per measurement.
Rev.2.00 Mar 30, 2006 page 4 of 5
HD74HCT238
Package Dimensions
JEITA Package Code P-SOP16-5.5x10.06-1.27 RENESAS Code PRSP0016DH-B Previous Code FP-16DAV MASS[Typ.] 0.24g
*1
D F 9
16
NOTE) 1. DIMENSIONS"*1 (Nom)"AND"*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION"*3"DOES NOT INCLUDE TRIM OFFSET.
bp
HE
E
Index mark
*2
Terminal cross section ( Ni/Pd/Au plating )
1 Z e
*3
8 bp x M L1
Reference Dimension in Millimeters Symbol
c
A1
y
L
Detail F
D E A2 A1 A bp b1 c c1 HE e x y Z L L1
Min Nom Max 10.06 10.5 5.50
0.00 0.10 0.20 2.20 0.34 0.40 0.46 0.15 0.20 0.25 0 8 7.50 7.80 8.00 1.27 0.12 0.15 0.80 0.50 0.70 0.90 1.15
JEITA Package Code P-SOP16-3.95x9.9-1.27
RENESAS Code PRSP0016DG-A
Previous Code FP-16DNV
*1
D 9
A
MASS[Typ.] 0.15g
F
16
NOTE) 1. DIMENSIONS"*1 (Nom)"AND"*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION"*3"DOES NOT INCLUDE TRIM OFFSET.
bp
E HE
Index mark
*2
Terminal cross section ( Ni/Pd/Au plating )
1 Z e
*3
c
8 bp x M L1
Reference Dimension in Millimeters Symbol
A1
L
y
Detail F
D E A2 A1 A bp b1 c c1 HE e x y Z L L1
Min Nom Max 9.90 10.30 3.95
0.10 0.14 0.25 1.75 0.34 0.40 0.46 0.15 0.20 0.25 0 8 5.80 6.10 6.20 1.27 0.25 0.15 0.635 0.40 0.60 1.27 1.08
Rev.2.00 Mar 30, 2006 page 5 of 5
A
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