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Details, datasheet, quote on part number:N74F251AD
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Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74F251A
FEATURES
· High speed 8-to-1 multiplexing · On chip decoding · Multifunction capability · Inverting and Non-Inverting outputs · Both outputs are 3-State for further multiplexer expansion
DESCRIPTION
The 74F251A is a logic implementation of a single 8-position switch with the switch position controlled by the state of three Select (S0, S1, S2) inputs. True (Y) and complementary (Y) outputs are both provided. The output enable (OE) is active Low. When OE is High, both outputs are in High impedance state, allowing multiple output connections to a common bus without driving nor loading the bus significantly. All but one device must be in High impedance state to avoid high currents that would exceed the maximum ratings when the outputs of the 3-State devices are tied together. When the output of more than one device is tied together the user must ensure that there is no overlap in the active Low portion of the output enable voltages.
PIN CONFIGURATION
I3 I2 I1 I0 Y Y OE GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC I4 I5 I6 I7 S0 S1 S2
SF00778
TYPE 74F251A
TYPICAL PROPAGATION DELAY 4.5ns
TYPICAL SUPPLY CURRENT (TOTAL) 19mA
ORDERING INFORMATION
ORDER CODE DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C N74F251AN N74F251AD PKG DWG # SOT38-4 SOT162-1
16-pin plastic DIP 16-pin plastic SO
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS I0I7 S0S2 OE Y, Y Data inputs Select inputs Output Enable input (active Low) Data outputs DESCRIPTION 74F (U.L.) HIGH/LOW 1.0/1.0 1.0/1.0 1.0/1.0 150/40 LOAD VALUE HIGH/LOW 20µA/0.6mA 20µA/0.6mA 20µA/0.6mA 3mA/24mA
NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.
LOGIC SYMBOL
4 3 2 1 15 14 13 12
IEC/IEEE SYMBOL
7 11 10 I0 I1 I2 I3 I4 I5 I6 I7 9 4 3 2 1 6 0 G 2 0 7 5 MUX
EN
11 10 9 7
S0 S1 S2 OE Y Y
15 14 13
VCC = Pin 16 GND = Pin 8
5
6
12
SF00779
SF00780
1996 Jan 05
1
8530358 16191
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74F251A
LOGIC DIAGRAM
I0 4 S0 11 I1 3 I2 2 I3 1 I4 15 I5 14 I6 13 I7 12
S1
10
S2
9
7 OE
5 VCC = Pin 16 GND = Pin 8 Y Y
6
SF00781
FUNCTION TABLE
INPUTS S2 X L L L L H H H H S1 X L L H H L L H H S0 X L H L H L H L H OE H L L L L L L L L OUTPUTS Y Z I0 I1 I2 I3 I4 I5 I6 I7 Y Z I0 I1 I2 I3 I4 I5 I6 I7
NOTES: H = High voltage level L = Low voltage level X = Don't care Z = High impedance "off" state
1996 Jan 05
2
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74F251A
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the operating free air temperature range.) SYMBOL VCC VIN IIN VOUT IOUT Tamb Tstg Supply voltage Input voltage Input current Voltage applied to output in High output state Current applied to output in Low output state Operating free-air temperature range Storage temperature PARAMETER RATING 0.5 to +7.0 0.5 to +7.0 30 to +5 0.5 to VCC 48 0 to +70 65 to +150 UNIT V V mA V mA °C °C
RECOMMENDED OPERATING CONDITIONS
SYMBOL VCC VIH VIL IIK IOH IOL Tamb Supply voltage High-level input voltage Low-level input voltage Input clamp current High-level output current Low-level output current Operating free-air temperature range 0 PARAMETER LIMITS MIN 4.5 2.0 0.8 18 3 24 70 NOM 5.0 MAX 5.5 UNIT V V V mA mA mA °C
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.) SYMBOL PARAMETER TEST CONDITIONS1 CONDITIONS VCC = MIN, VIL = MAX, VIH = MIN, IOH = MAX VCC = MIN, VIL = MAX, VIH = MIN, IOL = MAX VCC = MIN, II = IIK VCC = MAX, VI = 7.0V VCC = MAX, VI = 2.7V VCC = MAX, VI = 0.5V VCC = MAX, VI = 2.7V VCC = MAX, VI = 0.5V VCC = MAX MAX VCC = MAX 60 20 17 21 LIMITS MIN TYP2 MAX UNIT V 3.3 0.35 0.35 0.73 0.50 0.50 1.2 100 20 0.6 50 50 150 27 24 29 V V V V µA µA mA µA mA mA mA mA mA
VOH
High-level output voltage output voltage
±10%VCC ±5%VCC ±10%VCC ±5%VCC
2.4 2.7
VOL VIK II IIH IIL IOZH IOZL IOS ICC
Low-level output voltage output voltage Input clamp voltage Input current at maximum input voltage High-level input current Low-level input current Off-state output current High-level voltage applied Off-state output current Low-level voltage applied Short-circuit output current3 ICCH (total) Supply current ( l) ICCL ICCZ
NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type. 2. All typical values are at VCC = 5V, Tamb = 25°C. 3. Not more than one output should be shorted at a time. For testing IOS, the use of high-speed test apparatus and/or sample-and-hold techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any sequence of parameter tests, IOS tests should be performed last. 1996 Jan 05 3
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