SCHS249 Data sheet

SCHS249C November 1998 – May 2024 CD54AC273 , CD54ACT273 , CD74AC273 , CD74ACT273

PRODUCTION DATA

4.7 Switching Characteristics

Input t_r, t_f = 3ns, C_L = 50pF (Worst Case)

	PARAMETER	V_CC (V)	-40°C TO 85°C			-55°C TO 125°C			UNITS
	PARAMETER	V_CC (V)	MIN	TYP	MAX	MIN	TYP	MAX	UNITS
AC TYPES
t_PLH, t_PHL	Propagation Delay, CP to Qn	1.5	-	-	154	-	-	169	ns
		3.3 ⁽¹⁾	4.9	-	17.2	4.7	-	18.9	ns
		5 ⁽²⁾	3.5	-	12.3	3.4	-	13.5	ns
t_PLH, t_PHL	Propagation Delay, MR to Qn	1.5	-	-	154	-	-	169	ns
		3.3	4.9	-	17.2	4.7	-	18.9	ns
		5	3.5	-	12.3	3.4	-	13.5	ns
C_I	Input Capacitance	-	-	-	10	-	-	10	pF
C_PD ⁽³⁾	Power Dissipation Capacitance	-	-	45	-	-	45	-	pF
	ACT TYPES
t_PLH, t_PHL	Propagation Delay, CP to Qn	5⁽²⁾	3.5	-	12.3	3.4	-	13.5	ns
t_PLH, t_PHL	Propagation Delay, MR to Qn	5	3.5	-	12.3	3.4	-	13.5	ns
C_I	Input Capacitance	-	-	-	10	-	-	10	pF
C_PD q⁽³⁾	Power Dissipation Capacitance	-	-	45	-	-	45	-	pF

(2) 3.3V Min is at 3.6V, Max is at 3V.

(3) 5V Min is at 5.5V, Max is at 4.5V.

(4) C_PD is used to determine the dynamic power consumption per flip-flop.

Note:

AC: P_D = C_PD V_CC ² f_i = ∑ (C_L V_CC ² f_o)

ACT: P_D = C_PD V_CC ² f_i + ∑ (C_L V_CC ² f_o) + V_CC ΔI_CC where f_i = input frequency, f_o = output frequency, C_L = output load capacitance, V_CC = supply voltage.