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SN74LVTH18502A-EP Datasheet(PDF) 2 Page - Texas Instruments |
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SN74LVTH18502A-EP Datasheet(HTML) 2 Page - Texas Instruments |
2 / 42 page SN74LVTH18502AEP, SN74LVTH182502AEP 3.3V ABT SCAN TEST DEVICES WITH 18BIT UNIVERSAL BUS TRANSCEIVERS SCAS744A − DECEMBER 2003 − REVISED JUNE 2004 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) Data flow in each direction is controlled by output-enable (OEAB and OEBA), latch-enable (LEAB and LEBA), and clock (CLKAB and CLKBA) inputs. For A-to-B data flow, the device operates in the transparent mode when LEAB is high. When LEAB is low, the A-bus data is latched while CLKAB is held at a static low or high logic level. Otherwise, if LEAB is low, A-bus data is stored on a low-to-high transition of CLKAB. When OEAB is low, the B outputs are active. When OEAB is high, the B outputs are in the high-impedance state. B-to-A data flow is similar to A-to-B data flow, but uses the OEBA, LEBA, and CLKBA inputs. In the test mode, the normal operation of the SCOPE universal bus transceivers is inhibited, and the test circuitry is enabled to observe and control the I/O boundary of the device. When enabled, the test circuitry performs boundary-scan test operations according to the protocol described in IEEE Standard 1149.1-1990. Four dedicated test pins are used to observe and control the operation of the test circuitry: test data input (TDI), test data output (TDO), test mode select (TMS), and test clock (TCK). Additionally, the test circuitry performs other testing functions such as parallel-signature analysis (PSA) on data inputs and pseudorandom pattern generation (PRPG) from data outputs. All testing and scan operations are synchronized to the TAP interface. Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. The B-port outputs of SN74LVTH182502A, which are designed to source or sink up to 12 mA, include 25- Ω series resistors to reduce overshoot and undershoot. 18 19 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 21 22 23 24 63 62 61 60 59 64 58 56 55 54 57 25 26 27 28 29 53 52 17 51 50 49 30 31 32 1A3 1A4 1A5 GND 1A6 1A7 1A8 1A9 VCC 2A1 2A2 2A3 GND 2A4 2A5 2A6 1B4 1B5 1B6 GND 1B7 1B8 1B9 VCC 2B1 2B2 2B3 2B4 GND 2B5 2B6 2B7 PM PACKAGE (TOP VIEW) |
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