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X24257V14I-2.5 Datasheet(PDF) 2 Page - Xicor Inc. |
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X24257V14I-2.5 Datasheet(HTML) 2 Page - Xicor Inc. |
2 / 19 page X24257 – Preliminary Information Characteristics subject to change without notice. 2 of 19 REV 1.1.1 10/15/00 www.xicor.com PIN DESCRIPTIONS Serial Clock (SCL) The SCL input is used to clock all data into and out of the device. Serial Data (SDA) SDA is a bidirectional pin used to transfer data into and out of the device. It is an open drain output and may be wire-ORed with any number of open drain or open col- lector outputs. An open drain output requires the use of a pull-up resistor. For selecting typical values, refer to the Pull- up resistor selection graph at the end of this data sheet. Device Select (S0, S1) The device select inputs (S0, S1) are used to set bits in the slave address. This allows up to four devices to share a common bus. These inputs can be static or actively driven. If used statically they must be tied to VSS or VCC as appropriate. If actively driven, they must be driven with CMOS levels (driven to VCC or VSS) and they must be constant between each start and stop issued on the SDA bus. These pins have an active pull down internally and will be sensed as low if the pin is left unconnected. Write Protect (WP) WP must be constant between each start and stop issued on the SDA bus and is always active (not gated). The WP pin has an active pull down to disable the write protection when the input is left floating. The Write Protect input controls the Hardware Write Protect feature. When held LOW, Hardware Write Protection is disabled. When this input is held HIGH, and the WPEN bit in the Write Protect Register is set HIGH, the Write Protect Register is protected, preventing changes to the Block Lock Protection and WPEN bits. PIN NAMES PIN CONFIGURATION Symbol Description S0, S1 Device Select Inputs SDA Serial Data SCL Serial Clock WP Write Protect VSS Ground VCC Supply Voltage NC No Connect 8-Lead PDIP/SOIC VCC WP SCL 1 2 3 4 6 7 8 X24257 SDA 5 14-Lead TSSOP VCC WP SCL S0 S1 NC 1 2 3 4 7 6 5 X24257 VSS SDA NC NC NC NC 8 9 10 11 12 14 13 NC S1 SDA S2 SCL VCC VSS S0 WP 8 7 6 5 1 2 3 4 S2 8-Lead XBGA: Top View S0 S1 VSS S2 |
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