SN54HC74

Supply voltage range, V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V
Input clamp current, IIK (V_I < 0 or V_I > V_CC) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Output clamp current, I_OK (V_O < 0 or V_O > V_CC) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . .±20 mA
Continuous output current, I_O (V_O = 0 to V_CC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±25 mA
Continuous current through V_CC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  .±50 mA
Package thermal impedance, _JA (see Note 2): D package . . . . . . . . . . . . . . . . . . . . . . . . . . .86/W
                                                                          DB package . . . . . . . . . . . . . . . . . . . . . . . . ...9 6/W
                                                                          N package . . . . . . . . . . . . . . . . . . . . . . . . .  .  80/W
                                                                          NS package . . . . . . . . . . . . . . . . . . . . . . . . . . 76/W
                                                                          PW package . . . . . . . . . . . . . . . . . . . . .  . . . 113/W
Storage temperature range, T_stg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65/ to 150

The 'HC74 devices contain two independent D-type positive-edge-triggered flip-flops. A low level at the preset (PRE ) or clear (CLR) inputs sets or resets the outputs, regardless of the levels of the other inputs. When  (PRE )  and CLR are inactive (high), data at the data (D) input meeting the setup time requirements of HC74 are transferred to the outputs on the positive-going edge of the clock (CLK) pulse. Clock triggering occurs at a voltage level and is not directly related to the rise time of CLK. Following the hold-time interval, data at the D input can be changed without affecting the levels at the outputs.