Document
ADVANCE INFORMATION
PI74LVC3245A
8-Bit Dual Supply Bus Transceiver with 3-State Outputs
Product Features
• • • • 2.7V to 3.6V on A-port and 4.5V to 5.5V on B-port TTL Compatible Inputs Latch-up performance exceeds 200mA Per JESD78 ESD protection exceeds JESD22 2000V Human-Body Model (A114-B) 200V Machine Model (A115-A) • Industrial Temperature: –40°C to +85°C • Available Packages: 24-pin 173-mil wide plastic TSSOP (L) 24-pin 150-mil wide plastic QSOP (Q) 24-pin 300-mil wide plastic SOIC (S)
Product Description
Pericom Semiconductor’s PI74LVC series of logic circuits are produced using the Company’s advanced submicron CMOS technology, achieving industry leading speed. The PI74LVC3245A is a non-inverting 8-bit Bidirectional Transceiver that uses two seperate power supply rails. A-port (VCCA) is set to operate at 3.3V and B-port (VCCB) is set to operate at 5V. This allows for translation from a 3.3V to a 5Venvironment and vice-versa. This tranceiver is designed for asynchronous two-way communication between data buses. The direction control input pin (DIR) determines the dataflow from the A bus to the B bus or from the B bus to the A bus. The output enable (OE) input, when HIGH, disables both A and B ports by placing them in HIGH Z condition.
Logic Block Diagram
DIR 2
22
Product Pin Configuration
OE
(3.3V) VCCA DIR A1 A2 A3 A4 A5 A6 A7 A8 GND GND 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VCCB (5V) NC OE B1 B2 B3 B4 B5 B6 B7 B8 GND
A1 3
A2 4
A3 5
A4 6
A5 7
A6 8
A7 9
A8 10
21 B1 20 B2 19 18 17 16
B3
B4
B5
B6
15 B7 14 B8
Product Pin Description
Pin Name OE Outputs DIR Ax Bx NC GND VCCA,VCCB Description 3-State Output Enable Inputs (Active LOW) Direction Control Input Side A Inputs or 3-State Outputs Side B Inputs or 3-State Outputs NO Internal Connect Ground Power
Truth Table(1)
Inputs OE L L H DIR L H X Bus B Data to Bus A Bus A Data to Bus B Z (Isolation)
L = Low Signal Level Z = High Impedance 1
Note: 1. H = High Signal Level X = Don’t Care or Irrelevant
P-0.3
08/05/03
ADVANCE INFORMATION
PI74LVC3245A 8-Bit Dual Supply Bus Transceiver with 3-State Outputs
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Supply voltage range, VCCA and VCCB ............................ –0.5V to +7V Input voltage range, VI(2) : I/O ports (A-port) .... –0.5V to VCCA +0.5V I/O ports (B-port) ........... –0.5V to VCCB+0.5V Control Pins ................. –0.5V to VCCA +0.5V Input clamp current, IIK (VI <0)................................................–50mA Output clamp current, IOK (VO <0)...........................................–50mA Continous Output Current IO ..................................................±50mA Continous Current through each VCC or GND pin .....................±100mA Package thermal impedance, θJA(3): package L...................... 84°C/W package Q...................... 98°C/W package S ...................... 79°C/W Storage Temperature range, Tstg ................................–65°C to 150°C Notes: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 2. This value is limited to 7V maximum. 3. The package thermal impedance is calculated in accordance with JESD 51.
2
P-0.3
08/05/03
ADVANCE INFORMATION
PI74LVC3245A 8-Bit Dual Supply Bus Transceiver with 3-State Outputs
Recommended Operating Conditions(4)
Parameters VCCA VCCB VIHA VIHB VILA VILB Description Supply Voltage Supply Voltage High-Level Input Voltage High-Level Input Voltage Low-Level Input Voltage Low-Level Input Voltage High-Level Input Voltage (Control Pins) VOB ≤ 0.1v or VOB ≥ VCCB -0.1V VOA ≤ 0.1V or VOA ≥ VCCA -0.1V VOB ≤ 0.1V or VOB ≥ VCCB -0.1V VOA ≤ 0.1V or VOA ≥ VCCA -0.1V VOA ≤ 0.1V or VOA ≥ VCCA -0.1V, VOB ≤ 0.1V or VOB ≥ VCCB -0.1V VOA ≤ 0.1V or VOA ≥ VCCA -0.1V, VOB ≤ 0.1V or VOB ≥ VCCB -0.1V 2.7V 3.6V 3.3V 3.3V 2.7V 3.6V 3.3V 3.3V 2.7V 3.6V 2.7V 3.6V 5.0V 5.0V 4.5V 5.5V 5.0V 5.0V 4.5V 5.5V 4.5V 5.5V 4.5V 5.5V 0 0 0 0 2.7V 3V 3V 2.7V 3V 3V 4.5V 4.5V 4.5V 4.5V 4.5V 4.5V 2 2 0.8 0.8 VCCA VCCB VCCA VCCB -12 -24 -24 12 24 24 10 -40 85 ns/v ºC mA VCCA VCCB Min. 2.7 4.5 2 2 2 2 0.8 0.8 0.8 0.8 V Typ. 3.3 5 Max. 3.6 5.5 Units
VIH
VIL VIA VIB VOA VOB IOHA IOHB IOLA IOLB ∆t/∆v TA
Low-Level Input Voltage (Control Pins) Input Voltage Input Voltage Output Voltage Output Voltage High-Level Output Current High-Level Output Current Low-Level Output Current Low-Level Output Current Input transition Rise or Fall Rate Operating Free-Air Temp.
Note: 4. All unused inputs of the device must be held at the associated VCC or GND to ensure proper device operation.
3
P-0.3
08/05/03
ADVANCE INFORMATION
PI74LVC3245A 8-Bit Dual Supply Bus Tr.