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24VL014H Datasheet(PDF) 5 Page - Microchip Technology |
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24VL014H Datasheet(HTML) 5 Page - Microchip Technology |
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5 / 28 page  © 2008 Microchip Technology Inc. DS22116A-page 5 24VL014H 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE 2.1 SDA Serial Data This is a bidirectional pin used to transfer addresses and data into and out of the device. It is an open drain terminal. Therefore, the SDA bus requires a pull-up resistor to VCC (typical 10 k Ω for 100 kHz, 2 kΩ for 400 kHz). For normal data transfer, SDA is allowed to change only during SCL low. Changes during SCL high are reserved for indicating the Start and Stop conditions. 2.2 SCL Serial Clock The SCL input is used to synchronize the data transfer to and from the device. 2.3 A0, A1, A2 The A0, A1 and A2 inputs are used by the 24VL014H for multiple device operations. The levels on these inputs are compared with the corresponding bits in the slave address. The chip is selected if the compare is true. Up to eight 24VL014H devices may be connected to the same bus by using different Chip Select bit combinations. These inputs must be connected to either VCC or VSS. In most applications, the chip address inputs A0, A1 and A2 are hard-wired to logic ‘0’ or logic ‘1’. For applications in which these pins are controlled by a microcontroller or other programmable device, the chip address pins must be driven to logic ‘0’ or logic ‘1’ before normal device operation can proceed. 2.4 WP WP is the hardware write-protect pin. It must be tied to VCC or VSS. If tied to VCC, the hardware write protection is enabled and will protect half of the array (40h-7Fh). If the WP pin is tied to VSS the hardware write protection is disabled. 2.5 Noise Protection The 24VL014H employs a VCC threshold detector cir- cuit that disables the internal erase/write logic if the VCC is below 1.0 volts at nominal conditions. The SCL and SDA inputs have Schmitt Trigger and filter circuits that suppress noise spikes to assure proper device operation even on a noisy bus. Name 8-pin PDIP 8-pin SOIC 8-pin TSSOP 8-pin MSOP 8-pin TDFN Function A0 1 1 1 1 1 User Configurable Chip Select A1 2 2 2 2 2 User Configurable Chip Select A2 3 3 3 3 3 User Configurable Chip Select VSS 44 4 4 4 Ground SDA 5 5 5 5 5 Serial Data SCL 6 6 6 6 6 Serial Clock WP 7 7 7 7 7 Write-Protect Input VCC 8 8 8 8 8 +1.5V to 3.6V |
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