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Part: CD54AC245F3A
Category:
Logic
-> Transceivers
-> Standard Transceivers
Description: ti CD54AC245, Non-inverting Octal-bus Transceivers With 3-State Outputs
Company: Texas Instruments, Inc.
Datasheet: Download CD54AC245F3A datasheet File size : 224 kB
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Datasheet text preview:
CD54/74AC245, CD54/74ACT245
Data sheet acquired from Harris Semiconductor SCHS245B
September 1998 - Revised October 2000
Octal-Bus Transceiver, Three-State, Non-Inverting
Description
The 'AC245 and 'ACT245 are octal-bus transceivers that utilize Advanced CMOS Logic technology. They are noninver ting three-state bidirectional transceiver-buffers intended for two-way transmission from "A" bus to "B" bus or "B" bus to "A". The logic level present on the direction input (DIR) determines the data direction. When the output enable input (OE) is HIGH, the outputs are in the high-impedance state.
Features
· Buffered Inputs · Typical Propagation Delay - 4ns at VCC = 5V, TA = 25oC, CL = 50pF · Exceeds 2kV ESD Protection per MIL-STD-883, Method 3015 · SCR-Latchup-Resistant CMOS Process and Circuit Design · Speed of Bipolar FASTTM/AS/S with Significantly Reduced Power Consumption · Balanced Propagation Delays · AC Types Feature 1.5V to 5.5V Operation and Balanced Noise Immunity at 30% of the Supply · ±24mA Output Drive Current - Fanout to 15 FASTTM ICs - Drives 50 Transmission Lines
[ /Title (CD74 AC245 , CD74 ACT24 5) /Subject (OctalBus Transceiver, ThreeState, NonInverting) /Autho r () /Keywords (Harris Semiconductor, Advan ced CMOS , Harris Semicon-
Ordering Information
PART NUMBER CD54AC245F3A CD74AC245E CD74AC245M CD74AC245SM CD54ACT245F3A CD74ACT245E CD74ACT245M CD74ACT245SM NOTES: 1. When ordering, use the entire part number. Add the suffix 96 to obtain the variant in the tape and reel. 2. Wafer and die for this part number is available which meets all electrical specifications. Please contact your local TI sales office or customer service for ordering information. TEMP. RANGE (oC) -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 PACKAGE 20 Ld CERDIP 20 Ld PDIP 20 Ld SOIC 20 Ld SSOP 20 Ld CERDIP 20 Ld PDIP 20 Ld SOIC 20 Ld SSOP
Pinout
CD54AC245, CD54ACT245 (CERDIP) CD74AC245, CD74ACT245 (PDIP, SOIC, SSOP) TOP VIEW
DIR A0 A1 A2 A3 A4 A5 A6 A7 1 2 3 4 5 6 7 8 9 20 VCC 19 OE 18 B0 17 B1 16 B2 15 B3 14 B4 13 B5 12 B6 11 B7
GND 10
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. FASTTM is a Trademark of Fairchild Semiconductor. Copyright © 2000, Texas Instruments Incorporated
1
CD54/74AC245, CD54/74ACT245 Functional Diagram
A0 A1 A2 A3 A4 A5 A6 A7 2 3 4 5 6 7 8 9 1 DIR OE 19 18 17 16 15 14 13 12 11 B0 B1 B2 B3 B4 B5 B6 B7
TRUTH TABLE CONTROL INPUTS OE L L H DIR L H X OPERATION B Data to A Bus A Data to B Bus Isolation
H = High Level, L = Low Level, X = Irrelevant To prevent excess currents in the High-Z (isolation) modes, all I/O terminals should be terminated with 10k to 1M resistors.
2
CD54/74AC245, CD54/74ACT245
Absolute Maximum Ratings
DC Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 6V DC Input Diode Current, IIK For VI VCC + 0.5V . . . . . . . . . . . . . . . . . . . . . .±20mA DC Output Diode Current, IOK For VO VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±50mA DC Output Source or Sink Current per Output Pin, IO For VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±50mA DC VCC or Ground Current, ICC or IGND (Note 3) . . . . . . . . .±100mA
Thermal Information
Thermal Resistance (Typical, Note 5) JA (oC/W) E Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 M Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 SM Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Maximum Junction Temperature (Plastic Package) . . . . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300oC
Operating Conditions
Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC Supply Voltage Range, VCC (Note 4) AC Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5V to 5.5V ACT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V DC Input or Output Voltage, VI, VO . . . . . . . . . . . . . . . . . 0V to VCC Input Rise and Fall Slew Rate, dt/dv AC Types, 1.5V to 3V . . . . . . . . . . . . . . . . . . . . . . . . . 50ns (Max) AC Types, 3.6V to 5.5V . . . . . . . . . . . . . . . . . . . . . . . . 20ns (Max) ACT Types, 4.5V to 5.5V. . . . . . . . . . . . . . . . . . . . . . . 10ns (Max)
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES: 3. For up to 4 outputs per device, add ±25mA for each additional output. 4. Unless otherwise specified, all voltages are referenced to ground. 5. The package thermal impedance is calculated in accordance with JESD 51-7.
DC Electrical Specifications
TEST CONDITIONS PARAMETER AC TYPES High Level Input Voltage VIH 1.5 3 5.5 Low Level Input Voltage VIL 1.5 3 5.5 High Level Output Voltage VOH VIH or VIL -0.05 -0.05 -0.05 -4 -24 -75 (Note 6, 7) -50 (Note 6, 7) 1.5 3 4.5 3 4.5 5.5 5.5 1.2 2.1 3.85 1.4 2.9 4.4 2.58 3.94 0.3 0.9 1.65 1.2 2.1 3.85 1.4 2.9 4.4 2.48 3.8 3.85 0.3 0.9 1.65 1.2 2.1 3.85 1.4 2.9 4.4 2.4 3.7 3.85 0.3 0.9 1.65 V V V V V V V V V V V V V SYMBOL VI (V) IO (mA) VCC (V) 25oC MIN MAX -40oC TO 85oC MIN MAX -55oC TO 125oC MIN MAX UNITS
3
CD54/74AC245, CD54/74ACT245
DC Electrical Specifications (Continued)
TEST CONDITIONS PARAMETER Low Level Output Voltage SYMBOL VOL VI (V) VIH or VIL IO (mA) 0.05 0.05 0.05 12 24 75 (Note 6, 7) 50 (Note 6, 7) Input Leakage Current Three-State Leakage Current Quiescent Supply Current MSI ACT TYPES High Level Input Voltage Low Level Input Voltage High Level Output Voltage VIH VIL VOH VIH or VIL -0.05 -24 -75 (Note 6, 7) -50 (Note 6, 7) Low Level Output Voltage VOL VIH or VIL 0.05 24 75 (Note 6, 7) 50 (Note 6, 7) Input Leakage Current Three-State or Leakage Current Quiescent Supply Current MSI Additional Supply Current per Input Pin TTL Inputs High 1 Unit Load NOTES: 6. Test one output at a time for a 1-second maximum duration. Measurement is made by forcing current and measuring voltage to minimize power dissipation. 7. Test verifies a minimum 50 transmission-line-drive capability at 85oC, 75 at 125oC. II IOZ VCC or GND VIH or VIL VO = VCC or GND VCC or GND VCC -2.1 4.5 to 5.5 4.5 to 5.5 4.5 4.5 5.5 5.5 4.5 4.5 5.5 5.5 5.5 5.5 2 4.4 3.94 0.8 0.1 0.36 ±0.1 ±0.5 2 4.4 3.8 3.85 0.8 0.1 0.44 1.65 ±1 ±5 2 4.4 3.7 3.85 0.8 0.1 0.5 1.65 ±1 ±10 V V V V V V V V V V µA µA II IOZ VCC or GND VIH or VIL VO = VCC or GND VCC or GND VCC (V) 1.5 3 4.5 3 4.5 5.5 5.5 5.5 5.5 25oC MIN MAX 0.1 0.1 0.1 0.36 0.36 ±0.1 ±0.5 -40oC TO 85oC MIN MAX 0.1 0.1 0.1 0.44 0.44 1.65 ±1 ±5 -55oC TO 125oC MIN MAX 0.1 0.1 0.1 0.5 0.5 1.65 ±1 ±10 UNITS V V V V V V V µA µA
ICC
0
5.5
-
8
-
80
-
160
µA
ICC ICC
0 -
5.5 4.5 to 5.5
-
8 2.4
-
80 2.8
-
160 3
µA mA
4
CD54/74AC245, CD54/74ACT245
ACT Input Load Table
INPUT An, Bn OE DIR UNIT LOAD 0.83 0.64 0.25
NOTE: Unit load is ICC limit specified in DC Electrical Specifications Table, e.g., 2.4mA max at 25oC.
Switching Specifications Input tr, tf = 3ns, CL = 50pF (Worst Case)
-40oC TO 85oC PARAMETER AC TYPES Propagation Delay, Data to Output tPLH, tPHL 1.5 3.3 (Note 9) 5 (Note 10) Propagation Delay, Output Disable to Output tPLZ, tPHZ 1.5 3.3 5 Propagation Delay, Output Enable to Output tPZL, tPZH 1.5 3.3 5 Minimum (Valley) VOH During Switching of Other Outputs (Output Under Test Not Switching) Maximum (Peak) VOL During Switching of Other Outputs (Output Under Test Not Switching) Three-State Output Capacitance Input Capacitance Power Dissipation Capacitance VOHV See Figure 1 5 3.2 96 10.8 3 106 11.9 ns ns SYMBOL VCC (V) MIN TYP MAX -55oC TO 125oC MIN TYP MAX UNITS
2.2
-
7.7
2.1
-
8.5
ns
4.7 3.7 5.6 3.7 -
4 at 25oC
159 15.9 12.7 159 19 12.7 -
4.4 3.5 5.3 3.5 -
4 at 25oC
175 17.5 14 175 21 14 -
ns ns ns ns ns ns V
VOLP See Figure 1
5
-
1 at 25oC
-
-
1 at 25oC
-
V
CO CI CPD (Note 11)
-
-
15 57
10 -
-
15 57
10 -
pF pF pF
ACT TYPES Propagation Delay, Data to Output Propagation Delay, Output Disable to Output Propagation Delay, Output Enable to Output Minimum (Valley) VOH During Switching of Other Outputs (Output Under Test Not Switching) Maximum (Peak) VOL During Switching of Other Outputs (Output Under Test Not Switching) tPLH, tPHL tPLZ, tPHZ tPZL, tPZH VOHV See Figure 1 5 (Note 10) 5 2.7 9.1 2.5 10 ns
3.7
12.7
3.5
14
ns
5
3.8
13.1
3.6
14.4
ns
5
-
4 at 25oC
-
-
4 at 25oC
-
V
VOLP See Figure 1
5
-
1 at 25oC
-
-
1 at 25oC
-
V
5
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