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CAT28F020TRA-12T Datasheet(PDF) 8 Page - Catalyst Semiconductor |
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CAT28F020TRA-12T Datasheet(HTML) 8 Page - Catalyst Semiconductor |
8 / 15 page CAT28F020 8 Doc. No. 1029, Rev. C READ OPERATIONS Read Mode A Read operation is performed with both CE and OE low and with WE high. VPP can be either high or low, however, if VPP is high, the Set READ command has to be sent before reading data (see Write Operations). The data retrieved from the I/O pins reflects the contents of the memory location corresponding to the state of the 18 address pins. The respective timing waveforms for the read operation are shown in Figure 3. Refer to the AC Read characteristics for specific timing parameters. Signature Mode The signature mode allows the user to identify the IC manufacturer and the type of device while the device resides in the target system. This mode can be activated in either of two ways; through the conventional method of applying a high voltage (12V) to address pin A9 or by sending an instruction to the command register (see Write Operations). Figure 3. A.C. Timing for Read Operation 28F020 F05 ADDRESSES CE (E) OE (G) WE (W) DATA (I/O) HIGH-Z POWER UP STANDBY DEVICE AND ADDRESS SELECTION OUPUTS ENABLED DATA VALID STANDBY ADDRESS STABLE OUTPUT VALID tAVQV (tACC) tELQX (tLZ) tGLQX (tOLZ) tGLQV (tOE) tELQV (tCE) tAXQX (tOH) tGHQZ (tDF) tEHQZ (tDF) tAVAV (tRC) POWER DOWN HIGH-Z tWHGL The conventional mode is entered as a regular READ mode by driving the CE and OE pins low (with WE high), and applying the required high voltage on address pin A9 while all other address lines are held at VIL. A Read cycle from address 0000H retrieves the binary code for the IC manufacturer on outputs I/O0 to I/O7: CATALYST Code = 00110001 (31H) A Read cycle from address 0001H retrieves the binary code for the device on outputs I/O0 to I/O7. 28F020 Code = 1011 1101 (BDH) Standby Mode With CE at a logic-high level, the CAT28F020 is placed in a standby mode where most of the device circuitry is disabled, thereby substantially reducing power con- sumption. The outputs are placed in a high-impedance state. |
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