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TUSB2551ARGTR Datasheet(PDF) 3 Page - Texas Instruments |
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TUSB2551ARGTR Datasheet(HTML) 3 Page - Texas Instruments |
3 / 20 page FUNCTIONAL DESCRIPTION TUSB2551A www.ti.com...................................................................................................................................................................................................... SCES790 – JUNE 2009 TERMINAL FUNCTIONS TERMINAL NO. I/O DESCRIPTION NAME RGT PW System interface supply voltage. Used to provide reference supply voltage for system I/O interface VCC(I/O) 15 1 I signaling. Speed. Edge-rate control: A logic HIGH operates at edge rates for full-speed operation. A logic LOW SPEED 1 2 I operates at edge rates for low-speed operation. RCV 2 3 O Receive data. Output for USB differential data. If OE = 1, VP = Receiver output (+) VP 3 4 I/O If OE = 0, VP = Driver input (+) If OE = 1, VM = Receiver output (–) VM 4 5 I/O If OE = 0, VM = Driver input (–) SOFTCON 5 6 I Soft connect. Controls state of VPU(3.3). See VPU(3.3) pin description for details. GND 6 7 Ground reference SUSPEND 7 8 I Suspend. Active high. Turns off internal circuits to reduce supply current. NC 8, 16 No internal connection Output enable. Active low. Enables the transceiver to transmit data onto the bus. When inactive, the OE 9 9 I transceiver is in the receive mode. D–, D+ 10, 11 10, 11 I/O Differential data lines conforming to the USB standard 3.3-V reference supply. Requires a minimum 0.1- µF decoupling capacitor for stability. A 1-µF capacitor is Vreg(3.3) 12 12 O recommended. Pullup supply voltage. Used to connect 1.5-k Ω pullup speed detect resistor. VPU(3.3) 13 13 O If SOFTCON = 1, VPU(3.3) is high impedance. If SOFTCON = 0, VPU(3.3) = 3.3 V. VCC(5.0) 14 14 I USB bus supply voltage. Used to power USB transceiver and internal circuitry. FUNCTION SELECTION SUSPEND OE D+, D– RCV VP, VM FUNCTION 0 0 Driving Active Active Normal transmit mode 0 1 Receiving Active Active Normal receive mode 1 0 Hi-Z 0 Not active Low power state 1 1 Hi-Z 0 Active Receiving during suspend (low power state)(1) (1) During suspend, VP and VM are active to detect out-of-band signaling conditions. TRUTH TABLE DURING NORMAL MODE OE = 0 INPUT OUTPUT RESULT VP VM D+ D– RCV 0 0 0 0 X(1) SE0 0 1 0 1 0 Logic 0 1 0 1 0 1 Logic 1 1 1 1 1 X(1) Undefined OE = 1 INPUT OUTPUT RESULT D+ D– VP VM RCV 0 0 0 0 X(1) SE0 0 1 0 1 0 Logic 0 1 0 1 0 1 Logic 1 1 1 1 1 X(1) Undefined (1) X = Undefined Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Link(s): TUSB2551A |
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