August 1999
Revised October 1999
74ACT16540
16-Bit Inverting Buffer/Line Driver with 3-STATE Outputs
General Description
The ACT16540 contains sixteen inverting buffers with 3- STATE outputs designed to be employed as a memory and address driver, clock driver, or bus-oriented transmitter/ receiver. The device is byte controlled. Each byte has separate 3-STATE control inputs which can be shorted together for full 16-bit operation.
Features
■Separate control logic for each byte
■Outputs source/sink 24 mA
■TTL-compatible inputs
Ordering Code:
Order Number |
Package Number |
Package Description |
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74ACT16540SSC |
MS48A |
48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300” Wide |
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74ACT16540MTD |
MTD48 |
48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide |
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Device also available in Tape and Reel Specify by appending suffix letter “X” to the ordering code.
Logic Symbol |
Connection Diagram |
Pin Descriptions
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Pin Names |
Description |
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n |
Output Enable Input (Active LOW) |
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OE |
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I0–I15 |
Inputs |
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O |
0–O |
15 |
Outputs |
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FACTä is a trademark of Fairchild Semiconductor Corporation.
Outputs STATE-3 with Driver Buffer/Line Inverting Bit-16 74ACT16540
© 1999 Fairchild Semiconductor Corporation |
DS500299 |
www.fairchildsemi.com |
74ACT16540
Functional Description
The ACT16540 contains sixteen inverting buffers with 3- STATE standard outputs. The device is byte controlled with each byte functioning identically, but independent of the other. The control pins may be shorted together to obtain full 16-bit operation. The 3-STATE outputs are controlled by an Output Enable (OEn) input for each byte. When OEn is
LOW, the outputs are in 2-state mode. When OEn is HIGH, the outputs are in the high impedance mode, but this does not interfere with entering new data into the inputs.
Logic Diagram
Truth Tables
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Inputs |
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Outputs |
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OE1 |
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OE2 |
I0–I 7 |
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O0–O 7 |
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L |
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L |
H |
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L |
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H |
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X |
X |
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Z |
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X |
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H |
X |
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Z |
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L |
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L |
L |
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H |
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Inputs |
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Outputs |
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OE3 |
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OE4 |
I8–I 15 |
O8–O 15 |
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L |
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L |
H |
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L |
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H |
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X |
X |
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Z |
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X |
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H |
X |
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Z |
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L |
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L |
L |
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H |
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H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
www.fairchildsemi.com |
2 |
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC) |
−0.5V to +7.0V |
DC Input Diode Current (IIK) |
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VI = −0.5V |
−20 mA |
VI = VCC + 0.5V |
+20 mA |
DC Output Diode Current (IOK) |
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VO = −0.5V |
−20 mA |
VO = VCC + 0.5V |
+20 mA |
DC Output Voltage (VO) |
−0.5V to VCC + 0.5V |
DC Output Source/Sink Current (IO) |
± 50 mA |
DC VCC or Ground Current |
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per Output Pin |
± 50 mA |
Storage Temperature |
−65°C to +150°C |
Recommended Operating
Conditions
Supply Voltage (VCC) |
4.5V to 5.5V |
Input Voltage (VI) |
0V to VCC |
Output Voltage (VO) |
0V to VCC |
Operating Temperature (TA) |
−40°C to +85°C |
Minimum Input Edge Rate ( V/ t) |
125 mV/ns |
VIN from 0.8V to 2.0V |
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VCC @ 4.5V, 5.5V |
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Note 1: Absolute maximum ratings are those values beyond which damage to the device may occur. The databook specifications should be met, without exception to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. Fairchild does not recommend operation of FACTä circuits outside databook specifications.
DC Electrical Characteristics
Symbol |
Parameter |
VCC |
TA = +25°C |
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TA = −40°C to +85°C |
Units |
Conditions |
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(V) |
Typ |
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Guaranteed Limits |
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VIH |
Minimum HIGH |
4.5 |
1.5 |
2.0 |
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2.0 |
V |
VOUT = 0.1V |
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Input Voltage |
5.5 |
1.5 |
2.0 |
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2.0 |
or VCC − 0.1V |
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VIL |
Maximum LOW |
4.5 |
1.5 |
0.8 |
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0.8 |
V |
VOUT = 0.1V |
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Input Voltage |
5.5 |
1.5 |
0.8 |
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0.8 |
or VCC − 0.1V |
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VOH |
Minimum HIGH |
4.5 |
4.49 |
4.4 |
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4.4 |
V |
IOUT = −50 μA |
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Output Voltage |
5.5 |
5.49 |
5.4 |
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5.4 |
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VIN = VIL or VIH |
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4.5 |
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3.86 |
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3.76 |
V |
IOH = −24 mA |
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5.5 |
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4.86 |
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4.76 |
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IOH = −24 mA (Note 2) |
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VOL |
Maximum LOW |
4.5 |
0.001 |
0.1 |
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0.1 |
V |
IOUT = 50 μA |
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Output Voltage |
5.5 |
0.001 |
0.1 |
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0.1 |
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VIN = VIL or VIH |
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4.5 |
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0.36 |
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0.44 |
V |
IOL = 24 mA |
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5.5 |
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0.36 |
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0.44 |
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IOL = 24 mA (Note 2) |
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IOZ |
Maximum 3-STATE |
5.5 |
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± 0.5 |
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± 5.0 |
μA |
VI = VIL, VIH |
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Leakage Current |
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VO = VCC, GND |
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IIN |
Maximum Input |
5.5 |
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± 0.1 |
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± 1.0 |
μA |
VI = VCC, GND |
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Leakage Current |
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ICCT |
Maximum ICC/Input |
5.5 |
0.6 |
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1.5 |
mA |
VI = VCC − 2.1V |
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ICC |
Max Quiescent Supply Current |
5.5 |
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8.0 |
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80.0 |
μA |
VIN = VCC or GND |
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IOLD |
Minimum Dynamic |
5.5 |
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75 |
mA |
VOLD = 1.65V Max |
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IOHD |
Output Current (Note 3) |
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−75 |
mA |
VOHD = 3.85V Min |
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Note 2: All outputs loaded; thresholds associated with output under test.
Note 3: Maximum test duration 2.0 ms; one output loaded at a time.
74ACT16540
3 |
www.fairchildsemi.com |
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