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DG421CY Datasheet(PDF) 5 Page - Maxim Integrated Products |
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DG421CY Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 12 page Improved Low-Power, CMOS Analog Switches with Latches _______________________________________________________________________________________ 5 ___________________Pin Descriptions 1, 8 D1, D2 Drain Terminals 2 – W – — – R – Write Select 3, 4, 5, 6 N.C. No Internal Connection 7 – R – — – S – Reset Select 9, 16 S1, S2 Source Terminals 10, 15 IN1, IN2 Input Control 11 V+ Positive Supply 12 VL Logic Supply 13 GND Ground 14 V- Negative Supply 1, 8, 3, 6 2, 10, 4, 8 Drain Terminals 2 3 Write Select – W – — – R – 16, 9, 4, 5 20, 12, 5, 7 Source Terminals S1-S4 7 9 Resets Select D1-D4 15, 10 19, 13 Input Control IN1, IN2 11 14 Positive Supply V+ – R – — – S – 12 15 Logic Supply VL — 1, 6, 11, 16 No Internal Connection N.C. 14 18 Negative Supply V- 13 17 Ground GND PIN NAME FUNCTION DIP PLCC FUNCTION NAME Figure 1. Overvoltage Protection Using External Blocking Diodes __________Applications Information Operation with Supply Voltages Other Than ±15V The DG421/DG423/DG425 switches operate with ±4.5V to ±20V bipolar supplies or with a +10V to +30V single supply. In either case, analog signals ranging from V+ to V- can be switched. The Typical Operating Characteristics graphs illustrate typical analog-signal and supply-voltage on-resistance variations. The usual on-resistance temperature coefficient is 0.5%/°C (typ). Logic Inputs These devices operate with a single positive supply or with bipolar supplies. They maintain TTL compatibility with supplies anywhere in the ±4.5V to ±20V range as long as VL = +5V. If VL is connected to V+ or another supply at voltages other than +5V, the devices will operate at CMOS-logic-level inputs. Overvoltage Protection Proper power-supply sequencing is recommended for all CMOS devices. Do not exceed the absolute maxi- mum ratings because stresses beyond the listed rat- ings may cause permanent damage to the devices. Always sequence V+ on first, followed by VL, V-, and logic inputs. If power-supply sequencing is not possi- ble, add two small, external signal diodes in series with supply pins for overvoltage protection (Figure 1). Adding diodes reduces the analog signal range to 1V below V+ and 1V above V-, without affecting low switch resistance and low leakage characteristics. Device operation is unchanged, and the difference between V+ and V- should not exceed +44V. V+ D V- S Vg DG421 DG423/DG425 |
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