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ISP1123BD Datasheet(PDF) 5 Page - NXP Semiconductors |
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ISP1123BD Datasheet(HTML) 5 Page - NXP Semiconductors |
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5 / 49 page  Philips Semiconductors ISP1123 USB compound hub Preliminary specification Rev. 01 — 5 October 1999 5 of 49 9397 750 06325 © Philips Electronics N.V. 1999. All rights reserved. [1] Symbol names with an overscore (e.g. NAME) indicate active LOW signals. [2] The voltage at pin Vreg(3.3) is gated by the RESET pin. This allows fully self-powered operation by connecting RESET to VBUS (+5 V USB supply). If VBUS is lost upstream port D+ will not be driven. [3] See Table 4 “Mode selection”. [4] To disable a downstream port connect both D + and D− to V CC via a 1 MΩ resistor; unused ports must be disabled in reverse order starting from port 5. [5] Analog detection circuit can be switched off using an external EEPROM, see Table 23; in this case, the pin functions as a logic input (TTL level). [6] Downstream ports 1 and 2 cannot be disabled. PSW5/GL5/ GPSW [3] 18 O mode 5: power switch control output for downstream port 5 (open-drain, 6 mA) modes 3, 7: GoodLink LED indicator output for downstream port 5 (open-drain, 6 mA); to connect an LED use a 330 Ω series resistor modes 0 to 2: gang mode power switch control output (open-drain, 6 mA) XTAL1 19 I crystal oscillator input (6 MHz) XTAL2 20 O crystal oscillator output (6 MHz) RESET [2] 21 I reset input (Schmitt trigger); a LOW level produces an asynchronous reset; connect to VCC for power-on reset (internal POR circuit) OPTION/SCL 22 I/O mode selection input; also functions as I2C-bus clock output (open-drain, 6 mA) INDV/SDA 23 I/O selects individual (HIGH) or global (LOW) power switching and overcurrent detection; also functions as bidirectional I2C-bus data line (open-drain, 6 mA) DM5 24 AI/O downstream port 5 D − connection (analog) [4] DP5 25 AI/O downstream port 5 D + connection (analog) [4] DM1 26 AI/O downstream port 1 D − connection (analog) [6] DP1 27 AI/O downstream port 1 D + connection (analog) [6] DM0 28 AI/O upstream port D − connection (analog) DP0 29 AI/O upstream port D + connection (analog) DM2 30 AI/O downstream port 2 D − connection (analog) [6] DP2 31 AI/O downstream port 2 D + connection (analog) [6] PSW1/GL1 [3] 32 O modes 4 to 6: power switch control output for downstream port 1 (open-drain, 6 mA) modes 0 to 3, 7: GoodLink LED indicator output for downstream port 1 (open-drain, 6 mA); to connect an LED use a 330 Ω series resistor Table 2: Pin description for SO32 and SDIP32…continued Symbol [1] Pin Type Description |
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