|
|
Part: 74ALVCH245WM
Category:
Description: 74ALVCH245 - Low Voltage Bidirectional Transceiver With Bushold
Company: Fairchild Semiconductor
Datasheet: Download 74ALVCH245WM datasheet File size : 67 kB
Request For quote: Find where to buy 74ALVCH245WM
Datasheet text preview:
74ALVCH245 Low Voltage Bidirectional Transceiver with Bushold
September 2001 Revised February 2002
74ALVCH245 Low Voltage Bidirectional Transceiver with Bushold
General Description
The ALVCH245 contains eight non-inverting bidirectional buffers with 3-STATE outputs and is intended for bus oriented applications. The T/R input determines the direction of data flow. The OE input disables both the A and B Ports by placing them in a high impedance state. The ALVCH245 data inputs include active bushold circuitry, eliminating the need for external pull-up resistors to hold unused or floating data inputs at a valid logic level. The 74ALVCH245 is designed for low voltage (1.65V to 3.6V) VCC applications. The 74ALVCH245 is fabricated with an advanced CMOS technology to achieve high-speed operation while maintaining low CMOS power dissipation.
Features
s 1.65V to 3.6V VCC supply operation s Bushold on data inputs eliminates the need for external pull-up/pull-down resistors s tPD 3.6 ns max for 3.0V to 3.6V VCC 4.2 ns max for 2.3V to 2.7V VCC 6 ns max for 1.65V to 1.95V VCC s Uses patented Quiet Series noise/EMI reduction circuitry s Latchup conforms to JEDEC JED78 s ESD performance: Human body model > 2000V Machine model > 200V
Ordering Code:
Order Number 74ALVCH245WM 74ALVCH245MTC Package Number M20B MTC20 Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Logic Symbol
Pin Descriptions
Pin Names OE T/R A0A7 B0B7 Description Output Enable Input (Active LOW) Transmit/Receive Input Side A Bushold Inputs or 3-STATE Outputs Side B Bushold Inputs or 3-STATE Outputs
Quiet Series is a trademark of Fairchild Semiconductor Corporation.
© 2002 Fairchild Semiconductor Corporation
DS500648
www.fairchildsemi.com
74ALVCH245
Connection Diagram
Truth Table
Inputs OE L L H T/R L H X Bus B0B7 Data to Bus A0A7 Bus A0A7 Data to Bus B0B7 HIGH Z State on A0A7, B0B7 Outputs
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance
Logic Diagram
www.fairchildsemi.com
2
74ALVCH245
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC) DC Input Voltage (VI) Output Voltage (VO) (Note 2) DC Input Diode Current (IIK) VI < 0V DC Output Diode Current (IOK) VO < 0V DC Output Source/Sink Current (IOH/IOL) DC VCC or GND Current per Supply Pin (ICC or GND) Storage Temperature Range (TSTG)
-0.5V to +4.6V -0.5V to 4.6V -0.5V to VCC +0.5V -50 mA -50 mA ±50 mA ±100 mA -65°C to +150°C
Recommended Operating Conditions (Note 3)
Power Supply Operating Input Voltage (VI) Output Voltage (VO) Free Air Operating Temperature (TA) Minimum Input Edge Rate (t/V) VIN = 0.8V to 2.0V, VCC = 3.0V 10 ns/V
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 Characteristics tables are not guaranteed at the Absolute Maximum Ratings. The "Recommended Operating Conditions" table will define the conditions for actual device operation. Note 2: IO Absolute Maximum Rating must be observed, limited to 4.6V. Note 3: Floating or unused control inputs must be held HIGH or LOW.
1.65V to 3.6V 0V to VCC 0V to VCC
-40°C to +85°C
DC Electrical Characteristics
Symbol VIH Parameter HIGH Level Input Voltage Conditions VCC (V) 1.65 - 1.95 2.3 - 2.7 2.7 - 3.6 VIL LOW Level Input Voltage 1.65 - 1.95 2.3 - 2.7 2.7 - 3.6 VOH HIGH Level Output Voltage IOH = -100 µA IOH = -4 mA IOH = -6 mA IOH = -12 mA 1.65 - 3.6 1.65 2.3 2.3 2.7 3.0 IOH = -24 mA VOL LOW Level Output Voltage IOL = 100 µA IOL = 4 mA IOL = 6 mA IOL = 12 mA IOL = 24 mA II II(HOLD) Input Leakage Current Bushold Input Minimum Drive Hold Current 0 VI 3.6V VIN = 0.58V VIN = 1.07V VIN = 0.7V VIN = 1.7V VIN = 0.8V VIN = 2.0V 0 < VO 3.6V IOZ ICC ICC 3-STATE Output Leakage Quiescent Supply Current Increase in ICC per Input 0 VO 3.6V VI = V CC or GND, IO = 0 VIH = VCC - 0.6V 3.0 1.65 - 3.6 1.65 2.3 2.3 2.7 3.0 3.6 1.65 1.65 2.3 2.3 3.0 3.0 3.6 3.6 3.6 3 - 3.6 25 - 25 45 - 45 75 - 75 ±500 ±10 10 750 µA µA µA µA ±5.0 µA VCC - 0.2 1.2 2.0 1.7 2 .2 2 .4 2 0.2 0.45 0 .4 0 .7 0 .4 V V Min 0.65 x VCC 1 .7 2 .0 0.35 x VCC 0 .7 0 .8 V V M ax Units
3
www.fairchildsemi.com
74ALVCH245
AC Electrical Characteristics
TA = -40°C to +85°C, RL = 500 Symbol Parameter CL = 50 pF VCC = 3.3V ± 0.3V Min tPHL, tPLH tPZL, tPZH tPLZ, tPHZ Propagation Delay Output Enable Time Output Disable Time 1 .3 1.6 1.7 Max 3.6 5.5 5.5 VCC = 2.7V Min Max 4 .2 6.3 5.3 CL = 30 pF VCC = 2.5V ± 0.2V Min 1.0 2.0 0.8 Max 3 .7 6.0 4.8 VCC = 1.8V ± 0.15V Min 1.5 2.9 1.5 Max 6 .0 8.6 8.0 ns ns ns Units
Capacitance
Symbol CIN CI/O CPD Input Capacitance Input/Output Capacitance Power Dissipation Capacitance Parameter Control A or B Ports Conditions VI = 0V or VCC VI = 0V or VCC TA = +25°C VCC 3.3 3.3 3.3 2.5 1.8 Outputs Disabled f = 10 MHz, CL = 50 pF 3.3 2.5 1.8 Typical 4.5 12 31 28 25 0 0 0 pF pF pF Units
Outputs Enabled f = 10 MHz, CL = 0 pF
www.fairchildsemi.com
4
74ALVCH245
AC Loading and Waveforms
TABLE 1. Values for Figure 1 TEST tPLH, tPHL tPZL, tPLZ tPZH, tPHZ SWITCH Open VL GND
FIGURE 1. AC Test Circuit TABLE 2. Variable Matrix (Input Characteristics: f = 1MHz; tr = tf = 2ns; Z0 = 50) Symbol Vmi Vmo Vx Vy VL VCC 3.3V ± 0.3V 1.5V 1.5V VOL + 0.3V VOH - 0.3V 6V 2.7V 1.5V 1.5V VOL + 0.3V VOH - 0.3V 6V 2.5V ± 0.2V VCC/2 VCC/2 VOL + 0.15V VOH - 0.15V VCC*2 1.8V ± 0.15V VCC/2 VCC/2 VOL + 0.15V VOH - 0.15V VCC*2
FIGURE 2. Waveform for Inverting and Non-inverting Functions
FIGURE 3. 3-STATE Output High Enable and Disable Times for Low Voltage Logic
FIGURE 4. 3-STATE Output Low Enable and Disable Times for Low Voltage Logic
5
www.fairchildsemi.com
Others parts begin by 74
74-1 74-2 74-3 74-4 74-5 74-6 74-7 74-8 74-9 74-10 74-11 74-12 74-13 74-14 74-15 74-16 74-17 74-18 74-19 74-20 74-21 74-22 74-23 74-24 74-25 74-26 74-27 74-28 74-29 74-30 74-31 74-32 74-33 74-34 74-35 74-36 74-37 74-38 74-39 74-40 74-41 74-42 74-43 74-44 74-45 74-46 74-47 74-48 74-49 74-50 74-51 74-52 74-53 74-54 74-55 74-56 74-57 74-58 74-59 74-60 74-61 74-62
|
|
|
