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DM74ALS5245 Octal 3-STATE Transceiver
October 1986 Revised February 2000
DM74ALS5245 Octal 3-STATE Transceiver
General Description
This octal bus transceiver is designed for asynchronous two-way communication between data buses. The inputs include hysteresis which provides improved noise rejection. Data is transmitted either from the A bus to the B bus or from the B bus to the A bus depending on the logic level of the direction control (DIR) input. The device can be disabled via the enable input (G) which causes the outputs to enter the high impedance mode so the buses are effectively isolated.
Features
s Input Hysteresis s Low output noise generation s High input noise immunity s Advanced oxide-isolated, ion implanted Schottky TTL process s Switching specification guaranteed over the full temperature and VCC range s PNP inputs to reduce input loading
Ordering Code:
Order Number DM74ALS5245WM DM74ALS5245SJ DM74ALS5245N Package Number M20B M20D N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Connection Diagram
Function Table
Control Inputs Operation G L L H
L = LOW Logic Level
DIR L H X
H = HIGH Logic Level
B Data to A Bus A Data to B Bus High Impedance
X = Don't Care (Either LOW or HIGH Logic Level)
(c) 2000 Fairchild Semiconductor Corporation
DS009175
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DM74ALS5245
Absolute Maximum Ratings(Note 1)
Supply Voltage Input Voltage Control Inputs I/O Ports Operating Free-Air Temperature Range Storage Temperature Range Typical JA N Package M Package 56.0C/W 74.0C/W 7V 5.5V 0C to +70C -65C to +150C
Note 1: The "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristic tables are not guaranteed at the absolute maximum ratings. The "Recommended Operating Conditions" table will define the conditions for actual device operation.
7V
Recommended Operating Conditions
Symbol VCC VIH VIL IOH IOL TA Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Free Air Operating Temperature Range 0 Parameter Min 4.5 2 0.8 -15 24 70 Max 5.5 Units V V V mA mA C
Electrical Characteristics
over recommended free air temperature range. All typical values are measured at VCC = 5V, TA = 25C. Symbol VIK HYS VOH Parameter Input Clamp Voltage Hysteresis (VT+ - VT-) HIGH Level Output Voltage VOL II IIH IIL IO ICC LOW Level Output Voltage Input Current at Maximum Input Voltage HIGH Level Input Current LOW Level Input Current Output Drive Current Supply Current VCC = Max, VI = 2.7V VCC = Max, VI = 0.4V VCC = Max, VO = 2.25V VCC = Max Outputs HIGH Outputs LOW Outputs Disabled VOLP VOLV VIHD VILD Quiet Output Maximum Dynamic VOL Quiet Output Minimum Dynamic VOL Minimum High Level Dynamic Input Voltage Maximum Low Level Dynamic Input Voltage
Note 2: Plastic DIP package. Note 3: n = number of device outputs; n-1 outputs switching, each driven 0V to 3V one output @ GND. Note 4: n = number of device outputs; n outputs switching, n-1 inputs switching 0V to 3V. Input under test switching 3V to threshold (VILD); 0V to threshold (VIHD); f = 1 MHz.
Test Conditions VCC = Min, II = -18 mA VCC = Min VCC = 4.5V to 5.5V VCC = Min VCC = Min VCC = Max IOH = -0.4 mA IOH = -3 mA IOH = Max IOL = 12 mA IOL = 24 mA I/O Ports, VI = 5.5V Control Inputs, VI = 7V
Min
Typ
Max -1.5
Units V V V
0.2 VCC - 2 2.4 2
0.32 3.2 0.25 0.35 0.4 0.5 100 100 20 -100
V A A A mA mA
-30 30 36 38 0.5 -0.2 1.6 1.0
-112 45 55 58
VCC = 5.0V, TA = 25C (Figures 1, 2; (Note 2)(Note 3)) VCC = 5.0V, TA = 25C (Figures 1, 2; (Note 2)(Note 3)) VCC = 5.0V, TA = 25C (Note 2)(Note 4) VCC = 5.0V, TA = 25C (Note 2)(Note 4)
V V V V
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DM74ALS5245
Switching Characteristics
over recommended operating free air temperature range Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Output Enable Time to HIGH Level Output Output Enable Time to LOW Level Output Output Disable Time from HIGH Level Output Output Disable Time from LOW Level Output Conditions VCC = 4.5V to 5.5V, R1 = R2 = 500, CL = 50 pF From (Input) To (Output) A or B to B or A A or B to B or A Min 3 3 Max 10 10 Units ns ns
G to A or B
5
20
ns
G to A or B
5
20
ns
G to A or B
2
10
ns
G to A or B
4
15
ns
3
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DM74ALS5245
ALS Noise Characteristics
The setup of a noise characteristics measurement is critical to the accuracy and repeatability of the tests. The following is a brief description of the setup used to measure the noise characteristics of ALS. Equipment: Word Generator Printed Circuit Board Test Fixture Dual Trace Oscilloscope Procedure: 1. Verify Test Fixture Loading: Standard Load 50 pF, 500. 2. Deskew the word generator so that no two channels have greater than 150 ps skew between them. This requires that the oscilloscope be deskewed first. Swap out the channels that have more than 150 ps of skew until all channels being used are within 150 ps. It is important to deskew the word generator channels before testing. This will ensure that the outputs switch simultaneously. 3. Terminate all inputs and outputs to ensure proper loading of the outputs and that the input levels are at the correct voltage. 4. Set VCC to 5.0V. 5. Set the word generator to toggle all but one output at a frequency of 1 MHz. Greater frequencies will increase DUT heating and affect the results of the measurement. 6. Set the word generator input levels at 0V LOW and 3V HIGH. Verify levels with a digital volt meter.
VOLP/VOLV and VOHP/VOHV: * Determine the quiet output pin that demonstrates the greatest noise levels. The worst case pin will usually be the furthest from the ground pin. Monitor the output voltages using a 50 coaxial cable plugged into a standard SMB type connector on the test fixture. Do not use an active FET probe. * Measure VOLP and VOLV on the quiet output during the HL transition. Measure VOHP and VOHV on the quiet output during the LH transition. * Verify that the GND reference recorded on the oscilloscope has not drifted to ensure the accuracy and repeatability of the measurements. VILD and VIHD: * Monitor one of the switching outputs using a 50 coaxial cable plugged into a standard SMB type connector on the test fixture. Do not use an active FET probe. * First increase the input LOW voltage level, VIL, until the output begins to oscillate. Oscillation is defined as noise on the output LOW level that exceeds VIL limits, or on output HIGH levels that exceed VIH limits. The input LOW voltage level at which oscillation occurs is defined as VILD. * Next decrease the input HIGH voltage level on the word generator, VIH until the output begins to oscillate. Oscillation is defined as noise on the output LOW level that exceeds V IL limits, or on output HIGH levels that exceed VIH limits. The input HIGH voltage level at which oscillation occurs is defined as VIHD. * Verify that the GND reference recorded on the oscilloscope has not drifted to ensure the accuracy and repeatability of the measurements.
FIGURE 1. Quiet Output Noise Voltage Waveforms
Note 5: VOHV and VOHP are measured with respect to VOH reference. VOLV and VOLP are measured with respect to ground reference. Note 6: Input pulses have the following characteristics: f = 1 MHz, tr = 3 ns, tf = 3 ns, skew < 150 ps.
FIGURE 2. Simultaneous Switching Test Circuit
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DM74ALS5245
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M20B
5
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DM74ALS5245
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D
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DM74ALS5245 Octal 3-STATE Transceiver
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N20A
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 7 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com
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