Model Information for HEF4541BT,51

General Description

The HEF4541BT,51 is a programmable timer that includes a 16-stage binary counter, an integrated oscillator for use with external timing components, automatic power-on reset, and output control logic. The external components RTC and CTC determine the oscillator frequency within the range of 1Hz to 100kHz. An external clock signal at input RS can replace the oscillator, and the timer advances on the positive-going transition of RS.

Features and Benefits

• Wide Supply Voltage Range: 3.0V to 15.0V
• CMOS Low Power Dissipation: Ensures efficient operation.
• High Noise Immunity: Reduces susceptibility to electrical noise.
• Fully Static Operation: Maintains state without requiring dynamic refresh.
• 5V, 10V, and 15V Parametric Ratings: Provides flexibility in voltage requirements.
• Standardized Symmetrical Output Characteristics: Ensures consistent performance.
• Compliance: Meets JEDEC standard JESD 13-B.
• ESD Protection:HBM: ANSI/ESDA/JEDEC JS-001 class 2, exceeds 2000VCDM: ANSI/ESDA/JEDEC JS-002 class C3, exceeds 1000V
• Temperature Range: Specified from -40°C to +85°C and -40°C to +125°C

Ordering Information

• Package Type: SOT108-1
• Type Number: HEF4541BT
• Temperature Range: -40°C to +125°C
• Package Description: Plastic small outline package; 14 leads; body width 3.9 mm

Functional Description

The HEF4541BT,51 features an oscillator that can be used with external timing components to determine the frequency. The device also supports an external clock signal at the RS input. The timer advances on the positive-going transition of the RS input. The internal power-on reset is enabled by a LOW on both the auto reset input (AR) and the master reset input (MR). A HIGH level on the MR input resets the counter independent of all other inputs, disabling the oscillator to provide no active power dissipation.

The 16-stage counter divides the oscillator frequency by 28, 210, 213, or 216 depending on the state of the address inputs (A0, A1). The divided oscillator frequency is available at output O. The phase input (PH) features a complementary output signal. When the mode select input (MODE) is LOW, the timer operates as a single transition timer, and when HIGH, it operates as a 2n frequency divider.

Pinning Information

Pin Configuration

• RTC (Pin 1): External resistor connection
• CTC (Pin 2): External capacitor connection
• RS (Pin 3): External clock input or external resistor connection
• n.c. (Pin 4, 11): Not connected
• AR (Pin 5): Auto reset input (active low)
• MR (Pin 6): Master reset input
• VSS (Pin 7): Ground (0V)
• O (Pin 8): Timer output
• PH (Pin 9): Phase input
• MODE (Pin 10): Mode select input
• A0, A1 (Pin 12, 13): Address inputs
• VDD (Pin 14): Supply voltage

Limiting Values

• Supply Voltage (VDD): -0.5V to +18V
• Input Clamping Current (IIK): ±10mA
• Input Voltage (VI): -0.5V to VDD + 0.5V
• Output Clamping Current (IOK): ±10mA
• Input/Output Current (II/O): ±10mA
• Storage Temperature (Tstg): -65°C to +150°C
• Ambient Temperature (Tamb): -40°C to +125°C
• Total Power Dissipation (Ptot): 500mW (derates linearly with 10.1mW/K above 100°C for SOT108-1 package)
• Power Dissipation (P): 100mW

Recommended Operating Conditions

• Supply Voltage (VDD): 3V to 15V
• Input Voltage (VI): 0V to VDD
• Ambient Temperature (Tamb): -40°C to +125°C
• Input Transition Rate (Δt/ΔV):VDD = 5V: 3.75μs/VVDD = 10V: 0.5μs/VVDD = 15V: 0.08μs/V

Static Characteristics

Input Voltages

• VIH (HIGH-level input voltage):5V: 3.5V10V: 7.0V15V: 11.0V
• VIL (LOW-level input voltage):5V: 1.5V10V: 3.0V15V: 4.0V

Output Voltages

• VOH (HIGH-level output voltage):5V: 4.95V10V: 9.95V15V: 14.95V
• VOL (LOW-level output voltage):5V: 0.05V10V: 0.05V15V: 0.05V

Dynamic Characteristics

Propagation Delays

• tpd (RS to O):28 selected:5V: 375ns to 750ns10V: 150ns to 300ns15V: 110ns to 220ns210 selected:5V: 510ns to 1020ns10V: 330ns to 660ns15V: 270ns to 540ns213 selected:5V: 575ns to 1150ns10V: 380ns to 760ns15V: 270ns to 540ns216 selected:5V: 575ns to 1150ns10V: 420ns to 840ns15V: 300ns to 600ns

Pulse Width

• tW (RS LOW; MR HIGH):5V: 60ns to 30ns10V: 30ns to 15ns15V: 24ns to 12ns

Maximum Clock Frequency

• fclk(max):5V: 16MHz10V: 30MHz15V: 36MHz

Application Information

RC Oscillator Timing Component Limitations

• Oscillator Frequency: Determined by RTC and CTC.
• Recommended Values:CTC: ≥100pF, up to any typical value.RTC: 10kΩ ≤ RTC ≤ 1MΩ.
• Stray Capacitance (C2): Keep as small as possible.
• Accuracy Considerations: CTC must be larger than inherent stray capacitance. RTC must be larger than the CMOS 'ON' resistance in series with it (typically 500Ω at VDD = 5V, 300Ω at VDD = 10V, and 200Ω at VDD = 15V).

Typical Oscillator Frequency Formula

fosc​=2.3×RTC​×CTC​1​

Package Outline

• Package Type: SOT108-1 (SO14)
• Dimensions:Body Width: 3.9mmLead Count: 14 leads