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HT23C128
CMOS 16Kx8-Bit Mask ROM
Features
* * * *
*
Operating voltage: 2.7V~5.5V Low power consumption - Operation: 25mA Max. (V CC=5V) 10mA Max. (VCC=3V) - Standby: 30A Max. (VCC=5V) 10A Max. (VCC=3V) Access time:150ns Max. (VCC=5V) 250ns Max. (VCC=3V)
* * * *
16384x8 bits of mask ROM Mask options: chip enable CE/CE/OE2/OE2 and output enable OE/OE/NC & OE1/ OE1/NC TTL compatible inputs and outputs Tristate outputs Fully static operation Package type: 28-pin DIP/SOP
General Description
The HT23C128 is a read-only memory with high performance CMOS storage device whose 128K of memory is arranged into 16384 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 HT23C128 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
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HT23C128
Pin Assignment
Pin Description
Pin Name
NC A0~A13 D0~D7 VSS CE/CE/OE2/OE2 OE/OE/NC OE1/OE1/NC VCC
I/O
-- I O I I I I I No connection Address inputs Data outputs Negative power supply
Description
Chip enable/Output enable input Output enable input Output enable input Positive power supply
Operation Truth Table
Mode
Read Deselect Deselect Standby
CE/CE
H/L H/L H/L L/H
OE/OE
H/L L/H X X
OE1/OE1
H/L X L/H X
A0~A13
Valid X X X
D0~D7
Data Out High Z High Z High Z
Note: H=VIH, L=VIL, X=VIH or VIL
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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 CE0.2V CEVCC-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 VIH
Parameter
Operating Voltage Operating Current Input Low Voltage Input High Voltage
Test Conditions VCC
-- 5V 5V 5V
Conditions
-- O/P Unload, f=5MHz -- --
Min.
4.5 -- VSS 2.2
Typ.
-- -- -- --
Max. Unit
5.5 25 0.8 VCC V mA V V
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HT23C128
Test Conditions VCC
5V 5V 5V 5V 5V 5V -- --
Symbol
VOL VOH ILI ILO ISTB1 ISTB2 CIN COUT
Parameter
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 CE0.2V CEVCC-0.2V f=1MHz f=1MHz
Min.
-- 2.4 -- -- -- -- -- --
Typ.
-- -- -- -- -- -- -- --
Max. Unit
0.4 VCC 10 10 1.5 30 10 10 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
Unit
ns ns ns ns ns ns ns
Max.
-- 250 250 150 -- -- --
Max.
-- 150 150 80 -- 70 --
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
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HT23C128
Functional Description
The HT23C128 has two modes, namely data read mode and standby mode, controlled by CE/CE/OE2/OE2, OE/OE/NC and OE1/OE1/NC inputs.
* Standby mode * Data read mode
The HT23C128 has lower current consumption, controlled by the chip enable input (CE/CE). When a low/high level is applied to the CE/CEB input regardless of the output enable (OE/OE/NC and OE1/OE1/NC) states, the chip will enter the standby mode.
When both the chip enable (CE/CE/OE2/OE2) and the output enable (OE/OE/NC and OE1/OE1/NC) are active, the chip is in data read mode. Otherwise, active CE/CE and inactive OE/OE/NC or OE1/OE1/NC result in deselect mode. The output will remain in Hi-Z state.
Timing Diagrams
* Propagation delay due to address (CE/CE/OE2/OE2, OE/OE and OE1/OE1 are active)
* Propagation delay due to chip enable and output enable (address valid)
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HT23C128
Characteristic Curves
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HT23C128 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) OE2 (4) OE2 (a) 28 Pin Type Pin 20: (1) OE (2) OE (3) NC Pin 22: (1) OE1 (2) OE1 (3) NC Pin 27: (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)
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