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| HT23C512 CMOS 64Kx8-Bit Mask ROM Features * * * * * * * * * Operating voltage: 2.7V~5.5V Low power consumption - Operation: 25mA Max. (VCC=5V) 10mA Max. (VCC=3V) - Standby: 30A Max. (VCC=5V) 10A Max. (VCC=3V) Access time:150ns Max. (VCC=5V) 250ns Max. (VCC=3V) 65536x8 bits of mask ROM Mask options: chip enable CE/CE/OE1/OE1 and output enable OE/OE/NC TTL compatible inputs and outputs Tristate outputs Fully static operation Package type: 28-pin DIP/SOP General Description The HT23C512 is a read-only memory with high performance CMOS storage device whose 512K of memory is arranged into 65536 words by 8 bits. For application flexibility, the chip enable and output enable control pins can be selected as active high or active low. This flexibility not only allows easy interface with most microprocessors, but also eliminates bus contention in multiple bus microprocessor systems. An additional feature of the HT23C512 is its ability to enter the standby mode whenever the chip enable (CE/CE) is inactive, thus reducing current consumption to below 30A. The combination of these functions makes the chip suitable for high density low power memory applications. Block Diagram 1 24th Aug '98 HT23C512 Pin Assignment Pin Description Pin Name A0~A15 D0~D7 CE/CE/OE1/OE1 OE/OE/NC VSS VDD I/O I O I I I I Address inputs Data outputs Description Chip enable/Output enable input Output enable input Negative power supply Positive power supply Operation Truth Table Mode Read Deselect Standby CE/CE H/L H/L L/H OE/OE H/L L/H X A0~A15 Valid X X D0~D7 Data Out High Z High Z Note: H=VIH, L=VIL, X=VIH or VIL 2 24th Aug '98 HT23C512 Absolute Maximum Ratings* Supply Voltage ................................. -0.3V to 6V Input Voltage........................ -0.3V to VCC+0.3V Storage Temperature................. -50C to 125C Operating Temperature............... -40C to 85C *Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maximum Ratings" may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability. D.C. Characteristics Supply voltage: 2.7V~3.6V Ta=-40C to 85C Symbol VCC ICC VIL VIH VOL VOH ILI ILO ISTB1 ISTB2 CIN COUT Parameter Operating Voltage Operating Current Input Low Voltage Input High Voltage Output Low Voltage Output High Voltage Input Leakage Current Output Leakage Current Standby Current Standby Current Input Capacitance (See note) Output Capacitance (See note) Test Conditions VCC -- 3V 3V 3V 3V 3V 3V 3V 3V 3V -- -- Conditions -- O/P Unload, f=5MHz -- -- IOL=2.1mA IOH=-0.4mA VIN=0 to VCC VOUT=0 to VCC CE=VIL CE=VIH CE 0.2V CE VCC-0.2V f=1MHz f=1MHz Min. 2.7 -- VSS 2.0 -- 2.4 -- -- -- -- -- -- Typ. -- -- -- -- -- -- -- -- -- -- -- -- Max. Unit 3.6 10 0.4 VCC 0.4 VCC 10 10 500 10 10 10 V mA V V V V A A A A pF pF Note: These parameters are periodically sampled but not 100% tested. Supply voltage: 4.5V~5.5V Ta=-40C to 85C Symbol VCC ICC VIL Parameter Operating Voltage Operating Current Input Low Voltage Test Conditions VCC -- 5V 5V Conditions -- O/P Unload, f=5MHz -- Min. 4.5 -- VSS Typ. -- -- -- Max. Unit 5.5 25 0.8 V mA V 3 24th Aug '98 HT23C512 Test Conditions VCC 5V 5V 5V 5V 5V 5V 5V -- -- Symbol VIH VOL VOH ILI ILO ISTB1 ISTB2 CIN COUT Parameter Input High Voltage Output Low Voltage Output High Voltage Input Leakage Current Output Leakage Current Standby Current Standby Current Input Capacitance (See note) Output Capacitance (See note) Conditions -- IOL=3.2mA IOH= -1mA VIN=0 to VCC VOUT=0 to VCC CE=VIL CE=VIH CE 0.2V CE VCC-0.2V f=1MHz f=1MHz Min. 2.2 -- 2.4 -- -- -- -- -- -- Typ. -- -- -- -- -- -- -- -- -- Max. Unit VCC 0.4 VCC 10 10 1.5 30 10 10 V V V A A mA A pF pF Note: These parameters are periodically sampled but not 100% tested. A.C. Characteristics Symbol tCYC tAA tACE tAOE tOH tOD tOE Cycle Time Address Access Time Chip Enable Access Time Output Enable Access Time Output Hold Time Output Disable Time (See Note) Output Enable Time (See Note) Ta=-40C to 85C Parameter VCC=2.7V~3.6V Min. 250 -- -- -- -- -- -- VCC=4.5V~5.5V Min. 150 -- -- -- 10 -- 10 Max. -- 250 250 150 -- -- -- Max. -- 150 150 80 -- 70 -- Unit ns ns ns ns ns ns ns Note: These parameters are periodically sampled but not 100% tested. A.C. test conditions Output load: see figure right Input rise and fall time: 10ns Input pulse levels: 0.4V to 2.4V Input and output timing reference levels: 0.8V and 2.0V (VCC=5V) 1.5V (VCC=3V) Output load circuit 4 24th Aug '98 HT23C512 Functional Description The HT23C512 has two modes, namely data read mode and standby mode, controlled by CE/CE/OE1/OE1 and OE/OE/NC inputs. * Standby mode * Data read mode The HT23C512 has lower current consumption, controlled by the chip enable input (CE/CE). When a low/high level is applied to the CE/CE input regardless of the output enable (OE/OE/NC) states, the chip will enter the standby mode. When both the chip enable (CE/CE/OE/OE1) and the output enable (OE/OE/NC) are active, the chip is in data read mode. Otherwise, active CE/CE and inactive OE/OE/NC result in deselect mode. The output will remain in Hi-Z state. Timing Diagrams * Propagation delay due to address (CE/CE/OE1/OE1 and OE/OE are active) * Propagation delay due to chip enable and output enable (address valid) 5 24th Aug '98 HT23C512 Characteristic Curves 6 24th Aug '98 HT23C512 7 24th Aug '98 HT23C512 HT23C512 MASK ROM ORDERING SHEET Custom: Input Medium: EPROM User No. DISK File (Mail Address: romfile@holtek.com.tw) Type/Ref. Name Q'ty Check Sum OTHER Memory Address Start End Control Pin and Package Form Option: (1) CE (2) CE (3) OE1 (4) OE1 (a) 28 Pin Type Pin 20: (1) OE (2) OE (3) NC Pin 22: (1) Chip Form (2) 28 DIP (3) 28 SOP (b) Package Form: Companion User No. Package Marking Delivery Date : : Q'ty: CUSTOM CONFIRMED BY: (NAME, DATE, POSITION & CO. CHOP) HOLTEK CONFIRMED BY: (SALES) (SALES MANAGER) 8 24th Aug '98 |
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