Document
INTEGRATED CIRCUITS
DATA SHEET
PCB2421 1K dual mode serial EEPROM
Preliminary specification Supersedes data of 1995 Oct 11 File under Integrated Circuits, IC12 1997 Apr 01
Philips Semiconductors
Preliminary specification
1K dual mode serial EEPROM
CONTENTS 1 2 3 4 5 6 6.1 6.2 6.3 6.3.1 6.3.2 6.3.3 6.3.4 6.3.5 6.3.6 6.3.7 6.4 6.4.1 6.4.2 6.5 6.6 6.7 6.7.1 6.7.2 6.7.3 6.8 6.8.1 6.8.2 6.8.3 6.8.4 6.8.5 6.8.6 FEATURES GENERAL DESCRIPTION ORDERING INFORMATION BLOCK DIAGRAM PINNING FUNCTIONAL DESCRIPTION Transmit-only mode (DDC1) Initialization procedure Bidirectional mode (DDC2B, I2C-bus mode) Bidirectional mode bus characteristics Bus not busy (A) Start condition (B) Stop condition (C) Data valid (D) Acknowledge Slave address Write operation Byte write Page write Acknowledge polling Write protection Read operation Current address read Random read Sequential read Pin description SDA SCL VCLK WP Test n.c. 12 13 13.1 13.2 13.2.1 13.2.2 13.3 13.3.1 13.3.2 13.3.3 14 15 16 7 8 9 10 11 11.1 11.2 LIMITING VALUES DC CHARACTERISTICS
PCB2421
EEPROM CHARACTERISTICS AC CHARACTERISTICS APPLICATION INFORMATION Diode protection Functional compatibility with microchip 24CL21 dual mode EEPROM PACKAGE OUTLINES SOLDERING Introduction DIP Soldering by dipping or by wave Repairing soldered joints SO Reflow soldering Wave soldering Repairing soldered joints DEFINITIONS LIFE SUPPORT APPLICATIONS PURCHASE OF PHILIPS I2C COMPONENTS
1997 Apr 01
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Philips Semiconductors
Preliminary specification
1K dual mode serial EEPROM
1 FEATURES 2 GENERAL DESCRIPTION
PCB2421
• Single supply with operation 4.5 to 5.5 V • Completely implements DDC1/DDC2B interface for monitor identification • Low power CMOS technology • Two-wire I2C-bus interface • Self-timed write cycle (including auto-erase) • Page-write buffer for up to 8 bytes • Write-protect pin • 100 kHz I2C-bus compatibility • Designed for 10000 erase/write cycles minimum • Data retention greater than 10 years • 8-pin DIP and SO package • Temperature range 0 to +70 °C. 3 ORDERING INFORMATION
The Philips PCB2421 is a 128 × 8-bit dual mode serial Electrically Erasable PROM (EEPROM). This device is designed for use in applications requiring storage and serial transmission of configuration and control information. Two modes of operation have been implemented: transmit-only mode (DDC1 mode) and bidirectional mode (DDC2B, or I2C-bus mode). Upon power-up, the device will be in the transmit-only mode, sending a serial bitstream of the entire memory array contents, clocked by the VCLK pin. A valid HIGH-to-LOW transition on the SCL pin will cause the device to enter the bidirectional mode, with byte selectable read/write capability of the memory array. The PCB2421 is available in a standard 8-pin dual in-line and 8-pin small outline package operating in a commercial temperature range.
PACKAGE TYPE NUMBER NAME PCB2421P PCB2421T DIP8 SO8 DESCRIPTION plastic dual in-line package; 8 leads (300 mil) plastic small outline package; 8 leads; body width 3.9 mm VERSION SOT97-1 SOT96-1
1997 Apr 01
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Philips Semiconductors
Preliminary specification
1K dual mode serial EEPROM
4 BLOCK DIAGRAM
VSS 4 VDD 8 HV GENERATOR WP SDA SCL VCLK 3 5 6 7 I/O CONTROL LOGIC MEMORY CONTROL LOGIC X DECODER
PCB2421
book, full pagewidth
EEPROM ARRAY PAGE LATCHES
PCB2421
n.c. TEST(1) 2 1
Y DECODER
SENSE AMPLIFIER R/W CONTROL
MBG271
(1) Factory use only.
Fig.1 Block diagram.
5
PINNING DESCRIPTION factory use only: must be tied to VDD; may not be left open-circuit may be tied to VSS, VDD, or left open-circuit write protect input (LOW = write protected, HIGH = not write protected); may not be left open-circuit ground serial data input/output serial clock input/output (DDC2B) serial clock input (transmit-only mode, DDC1) supply voltage
handbook, halfpage
SYMBOL PIN TEST n.c. WP 1 2 3
TEST n.c. WP VSS
1 2
8 7
VDD VCLK SCL SDA
PCB2421
3 4
MBG272
6 5
VSS SDA SCL VCLK VDD
4 5 6 7 8
Fig.2 Pin configuration.
1997 Apr 01
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Philips Semiconductors
Preliminary specification
1K dual mode serial EEPROM
6 FUNCTIONAL DESCRIPTION
PCB2421
When the device has been switched into the bidirectional mode, the VCLK input is disregarded. This mode supports a two-wire bidirectional data transmission protocol (I2C-bus protocol). In the I2C-bus protocol, a device that sends data on the bus is defined to be the transmitter, and a device that receives data from the bus is defined to be the receiver. The bus must be controlled by a master device that generates the bidirectional mode clock, controls access to the bus, and generates the START and STOP conditions, while the PCB2421 acts as slave. Both master and slave can operate as transmitter or receiver, but the master device determines which mode is activated. 6.3.1 BIDIRECTIONAL MODE BUS CHARACTERISTICS
The PCB2421 operates in two modes, the transmit-only mode (DDC1) and the bidirectional mode (DDC2, or I2C-bus mode). There is a separate two-wire protocol to support each mode, .